I just thought DOTA2 was underwhelming compared to LoL. Graphically better? Sure. But I like the heroes in LoL more, they feel less generic as weird as that sounds. DOTA seems stuck trying to mimic the Warcraft heroes the original were based on without access to the actual characters.
I've been in DOTA2 beta for awhile and barely touch it because I think LoL is better.