New Years PC Game Recommendation

It's been a while since I played a great game, I have always enjoyed gaming until 2 years ago when World of Warcaft drained my gaming juices after 2 years of non-stop playing. I couldn't go on anymore, even tough I loved WoW and never regretted my dedication to the game, the fun was gone. The gamer in me had enough and needed his rest... but now he's back again :-).

I had my first full day gaming session in a long time yesterday after my little brother had introduced me to Saints Row: The Third, this insane over the top GTA like game that I now love sparked something in me that I hadn't felt in a long time. So now I'm back in the game and need some advice!

What are the must-play PC games of the last year(s) and why?

P.S. Have a great new year!