I voted for Starcraft 2, phenomenal RTS game.
No Mass Effect 2?
Seriously how can one not add ME2 to the list?
But this list is biased anyways... It always depends on how the creator feels about the games.
Still you didn't add ME2 so j00 suck!
Starcraft 2, excellent game, beautiful campaign. Blizzard is being a little suckish about company property though. I vote Other and I say ME2.
Although if it were best RTS I'd definitively say SC 2.