1. Starcraft II: Wings of Liberty

When it comes to gameplay, presentation, and polish, I'm not sure there's a better game on any platform, than Starcraft II. From constantly moving your units away from rising lava during one campaign mission, to defending your workers from an early rush in multiplayer, Starcraft II: Wings of Liberty does so much right in terms of balance, graphics, attention to detail, and just plain fun, it's easy to forget this is technically only the first third of a complete game. Blizzard has its work cut out trying to top this with its forthcoming expansions, but I wouldn't trust any other developer to even try.