Arena of Heroes is really great tactical game. The gameplay consists of battling intergalactic teams in realtime or asynchronous modes. You can play against your friends via the multiplayer mode, or against the computer in single-player modes.
This game is not overpowered in any sense. Everything is balanced and it makes the game enjoyable for a long time. You can also enjoy this game without having to spend money on gems, even though you can purchase them if the need arises.
Arena of Hereos is a cross between action and strategy games and is an absolute must-have!