1. The Elder Scrolls V: Skyrim
I have like 220 hours played.
2. Deus Ex: Human Revolution
Pimp Simulator: 2011
3. Portal 2
4. Dead Space 2
I bet Isaac listens to wub. Get it, he stomps? No? I'll see myself out.
5. Saints Row: The Third
Hoverbikes. Hover. Bikes.
6. Battlefield 3
7. Red Orchestra 2: Heroes of Stalingrad
Russians, hilarious bugs (alas not any more), Russians, fear for your very life and did I mention Russians.
8. Dead Island
Zombies and loot with a skill-tree. What's not to like.
9. Halo: Combat Evolved Anniversary
Only console game on the whole list and it's Halo. How totally unexpected of me.
10. S.T.A.L.K.E.R.: Shadow of Chernobyl
Don't care, gotta stalk.