Ironically, from what I understand (haven't done direct comparisons myself), a lot of games written for windows run just as well or better on linux.

DOTA 2 is just noteworthy to me because it's an exception to the "other than competitive games" exception. And while I can't say for sure that no one is hacking on there, I have yet to see any blatant cases of it (though admittedly it might be difficult to tell in a game where it's normal for some players to snowball significantly over others).