1. Deus Ex: Human RevolutionDeus Ex: Human Revolutionhttps://giantbomb.com/wiki/Games/Deus_Ex_Human_RevolutionOpens wiki page
A worthy successor to the original.
2. The Witcher 2: Assassins of KingsThe Witcher 2: Assassins of Kingshttps://giantbomb.com/wiki/Games/The_Witcher_2_Assassins_of_KingsOpens wiki page
Amazing setting and a story with a great sense of player choice and consequence. The combat has some problems, specifically the lack of a dodge cancel during attack animations and I was compelled to play the game on easy to enjoy the great story.
3. Fight Night ChampionFight Night Championhttps://giantbomb.com/wiki/Games/Fight_Night_ChampionOpens wiki page
FNC fuses my strange obsession with boxing and video games. It has many improvements over FNR4 including an interesting story mode. This is the first sports game that I spent significant time in the online mode. Very fun.
4. Gears of War 3Gears of War 3https://giantbomb.com/wiki/Games/Gears_of_War_3Opens wiki page
5. BastionBastionhttps://giantbomb.com/wiki/Games/BastionOpens wiki page
6. BulletstormBulletstormhttps://giantbomb.com/wiki/Games/BulletstormOpens wiki page
Excellent gameplay and the story does a wonderful job of turning an annoying anti-hero into a sympathetic main character.
7. Warhammer 40,000: Space MarineWarhammer 40,000: Space Marinehttps://giantbomb.com/wiki/Games/Warhammer_40_000_Space_MarineOpens wiki page
Space Marines!!!! I have thoroughly enjoyed all of Relic's Warhammer 40k games. The setting is great.
8. L.A. NoireL.A. Noirehttps://giantbomb.com/wiki/Games/L_A_NoireOpens wiki page
9. Mortal KombatMortal Kombathttps://giantbomb.com/wiki/Games/Mortal_Kombat_2011Opens wiki page
Great Story Mode and gameplay. I never took it online but I enjoyed the offline modes a quite a bit.
10. Mount & Blade: WarbandMount & Blade: Warbandhttps://giantbomb.com/wiki/Games/Mount_And_Blade_WarbandOpens wiki page
This is not a 2011 game but I discovered it then and put in well over 100 hours into the main campaign and the Pendor mod.