Do you remember Monday Night Combat, a game that combined elements of the tower defence genre, Dota, and Team Fortress 2? It launched originally on Xbox Live Arcade and later on Steam, and had moderate success.
Now the successor is here, Super Monday Night Combat, and it leans even more to the Dota/MOBA genre while it combines this with the best elements from the third person action genre.
It's free to download and play so if it sounds interesting head over to the game page over on Steam.