In general, I would like to propose there are a few typical things that people enjoy:
- Creative expression
- Mastering something through practice
When you find a new strategy that you have never seen before, or discover a niche for a tower you previously thought was useless, this can be a lot of fun due to creative expression. Being able to do things in a new way, either new to you or new to the meta-game, is a key factor for creative expression. The random-factor of the Prophet is what provides this creative expression when playing Legion TD.
Being able to execute a plan perfectly or get ideal focus on a boss wave due to unit placement is a reward for the organized. Being able to manage your wisp count vs tower value in order to hold the waves with the minimum amount possible is a large part of the game. Coordinating with teammates on sending and on building is crucial to playing competitively.
Often, the outcome of the game comes down to the team-mates you get. This can be extremely frustrating for highly competitive people. They might do every little thing right but because their team-mate was not playing correctly, the game is lost anyway. Legion TD lends itself quite well to being competitive, since there is a very fine line between holding and leaking on a send wave and winning or losing a race send. Many strategies exist to milk the most power out of the best players, such as allocating extra gold to them via strategic leaks or giving them control of the king.
Legion TD is very good at rewarding practice. There are 90 base units, each with at minimum 1 upgrade, resulting in more than 200 towers to learn. Generally speaking, most of them work best paired with other towers, and have strong and weak waves. Due to the sheer volume of content in the game, the more you play the better you will become, almost without a limit. At the same time, Legion TD doesn't suffer from the usual "high learning curve" that many games of similar complexity have which discourage newbies from learning. Although the competitive team-mates will often drive away new players with anger and impatience, the game itself is generally appealing to learn for new players.
Which of these groups are you most defined by? Do you find any of these things lacking in Legion? Would you like to see more attention given to rewarding one or more of these categories? Are there any categories that I missed?