First Review and Personal Opinion.This game require huge resources for "low budget PC", I have tested it n my 3 PCs and so here the results.
Is a Pay Per/for Play game. There is an online shop where to buy customization Items for your avatar and also you can Create you own equipment and earn moneys if it's accepted by Steamworkshop and a % on the Sold out at the Online Shop.
Set 1 (Low Budget PC)
Intel Pentium Celeron MX 1.4Ghz with 1.8GB Ram, WIndows XP, Video Card used for the Test:
Nvidia GeForce TNT2 Ultra 256Mb
On Lowest Resolution and No graphic Effects gameplay might still be Enjoyable even tho it will suck as graphic. Diablo Original was two ways better in graphics 
Perma LagSet 2 (Mid Budget PC)
AMD Athlon XP 2.5@Ghz with 3GB Ram,Windows XP, Video Card used for the test:
Nvidia Geforce "Medusa" 5ti 512mb
On low/mid resolution and with all the special effects disabled, might be playable, even tho it might still lag at random points of the game. Adding various effects game might result very slow and Laggy.Set 3 ( my currently one i am using ATM everyday: High Budget PC)
Intel Pentium Extreme 3.2Ghz, 6GB Ram. MB: ROG Asus Commando Black, Video Card Used for the test:
2x Nvidia Ge Force 9800GT 1Ghz DDR3
It might be my Video card that is damaged in this last 3-4 years.But Still have few Graphic "freeze" when joining Game. Realtively i'm using all the effects On Except the Shadows, Antialiasing On. 1280x1024 As Resolution and it's Very Good.--Review--NOTE: Dota 2 is a deep and robust game with a steep learning curve. It is highly recommended that you explore the tutorial mode, play with bots, and read some introductions before you jump in and play. The average game of Dota 2 lasts 45-50 minutes. It is highly detrimental to other player's game experience if you leave before finishing the game and is heavily frowned upon. (
But we all know, But I have to introduce to those that never played the game before or are completely new to dota system. So excuse me if I sound Boring )
Dota 2 is played with 10 players (bots can be enabled for practice mode) and pits 5 players on one side versus 5 on the other. The 2 sides are named 'Radiant' and 'Dire'. Each team starts on opposite corners of the map. Each player controls one hero for the length of the match.
The map is broken up into 3 lanes, with interconnecting rivers and forests, leading to the opposing base. Each lane is lined with 6 towers (3 for each team) that will attack enemy players or units that approach. The river is not a straight diagonal, making a longer 'safe' lane and a shorter 'suicide' lane for each team. The Dire Safe lane is their top lane and their Suicide lane is on the bottom. The two thrones are also defended by additional surrounding towers. The objective of the game is to destroy all the enemy towers and ultimately their throne. Each base has two structures for each lane that spawns 'creeps' or monsters at regular intervals to send to attack the enemy structures. You and your team's job is to fight the enemy team and eventually destroy their throne.
By destroying the buildings that spawn the creeps (also called 'Barracks'), your team's creeps will get stronger in that lane and overpower then enemy. The more buildings that you can destroy at an enemy base the stronger your creeps will become and eventually overpower them.
Dota 2 is a sequel to Dota or Defense of the Ancients, which was a user-created map for Warcraft 3. For more on the evolution of Dota see Dota History. Dota and Dota 2 have been classified by many as MOBA games, or Multiplayer Online Battle Arena games.
Dota 2 is played with 10 players (bots can be enabled for practice mode) and pits 5 players on one side versus 5 on the other. The 2 sides are named 'Radiant' and 'Dire'. Each team starts on opposite corners of the map. Each player controls one hero for the length of the match.
The ultimate object of any game of Dota 2 is to destroy the 'Throne' of the opposing team. This is the last building, and situated the deepest in each base.
By destroying the buildings that spawn the creeps (also called 'Barracks'), your team's creeps will get stronger in that lane and overpower then enemy. The more buildings that you can destroy at an enemy base the stronger your creeps will become and eventually overpower them.
Leveling Up
Each hero starts at level 1. You gain experience by being near creeps or enemy heroes that die. This means you want to stay in one of the 3 lanes where the creeps are fighting as often as possible so as to keep leveling up. You will be at a significant disadvantage if the enemy hero is multiple levels higher than you. While near the creeps, heroes will try to scare or 'harass' other players away from the creeps so they don't get as much experience. Enemy players will also try to team up with other heroes or 'gank' you to gain gold and experience and set you back. This is something to be mindful of as a new player. The point of the game is to die as little as possible, level up, buy items, and kill enemy players when possible.
Getting Gold
Each hero slowly gains gold (5 gold per second) as the game goes on. You can get extra gold by killing creeps and enemy heroes. Heroes get gold for assisting or killing enemy heroes. If a hero dies that hero will lose a portion of their in-game gold. If you get the last hit on a creep you will gain a gold bonus. It is recommended to try to get the killing blow on as many creeps as possible to gain as much gold as possible. This is called 'last hitting' and is very important in a successful Dota 2 team. Denying is a way to stop the enemy team from getting gold. If an allied hero gets the last hit on an allied creed the gold is 'denied' to the enemy.Your team also can get a gold bonus from killing enemy structures. Towers can be denied for a reduced reward, but this is a very risky maneuver. Also there are neutral creeps scattered throughout the woods of the map. These creeps won't attack unless you get near them, but they will give a gold bonus upon being last-hit.
Once you start getting gold, the items that you choose to buy can greatly affect the outcome of the game and the Strength (or Agility, or Intelligence!) of your hero. See our Items section for a breakdown of each item and its effects and uses.
here are five modes currently available in the Dota 2 Beta:
All Pick - All Heroes are available to all players. Every player picks their heroes at the same time. A player can also choose to "random" a hero, which will (you guessed it) choose a random Hero for the player, as well as give the player a bonus 250 starting gold. This is the mode used in the current matchmaking system.
Captain's Mode - Two players, one from each team (blue for radiant, pink for dire), take turns banning and picking Heroes for their team. Banning a hero removes it from the pool, making it unavailable to pick for either team. This is the usual mode for organized and competitive games.
Single Draft - Each player selects a Hero from a set of three heroes randomly chosen for them.
Random Draft - Players take turns selecting a Hero from a shared pool of 20 random heroes.
Diretide - All heroes are picked in the same manner as All Pick. However, the game objective is to collect more taffy in your bucket than the enemy team. Greevil Taffy is dropped by smaller models of Roshan, and decrease Hero HP by 7% while held. They can be stolen from the enemy bucket and drop upon Hero death. Throughout the later stages of the game, Roshan roams the map, demanding candy or he will attack. During the Sugar Rush final stage, Roshan becomes a defeatable boss with unique abilities and a massive amount of health. This mode was added in for Halloween 2012.
Actual to now Updated with
new characters and
upgrades.
See Ya
