With nearly 500 hours on record this is the second most addictive game in my library. It is NOT pay to win as another reviewer has written. Strategy is key to victory here, not cash. If you think this game is pay to win then you obviously haven't put in the patience required to learn each teams strengths and weaknesses and adjust your strategy accordingly. There are additional teams that one CAN purchase if they wish, it doesn't matter if you choose not to though, as all of the teams (although quite unique) are exceptionally well balanced.
The game can be a bit buggy.. (eg. game state occasionally needs a refresh before opponents pieces move) This is probably one of the unfortunate side effects of being a cross-platform game. The strategy involved is on par with chess, maybe not as rich as some players would like. Some people complain that players are not forced to move within a time limit, I happen to like this feature as I can leave the game minimized while I am working and take my turn when I am ready.
In spite of it's minor short comings, Hero Academy succeeds in providing interesting turn-based strategy gameplay, which if you're a fan of such gameplay you know there are far too few games of this type on the market. I wish there were more games like Hero Academy out there.