For me it's been games like The Witcher 2, Portal series, Dragon Age: Origins, Mass Effect, Bioshock, Skyrim, Metro 2033 (great game, do recommend it) and so on.
A game that I loved was Darksiders, it just took elements of Zelda and God of War and combined them really well. Had a great story to it and fantastic gameplay, it gets a bit overlooked but still an awesome game.
On a similar note, any indie games that have stood out for you guys?
Planescape and Fallout 1&2 I've always wanted to try out, I'll get them as soon as I can but I've heard good things about them. I never played the PC BG's but BG: DA 1 & 2 I absolutely loved, being able to build my character and the co-op work that it included.
I also love the Dynasty Warriors series just for the fun of hacking and slashing through and entire army, it's not anything ground breaking or too challenging but it's always been great fun for me to play. It's a game that could become so much better if they just broke away from their current formula a bit, but meh.