Fallout 3 because of the amount of player choice and the interesting things to do in the game world. Plus I love VATS. The Souls series would make the list as well but some people don't consider those to be true RPGs.
I boosted some of my trophies. Please, judge me about it.
The Mass Effect trilogy. The story, world/s, and characters really just pull me into the universe. Being able to create your own character and the freedom to play and react the way a player want (not many games give the option to kick a dude out a window. Also, the gameplay is really good.
Dragon's Dogma also get a mention. I really enjoyed this game and getting the expansion "Dark Arisen" day 1, but the story was really lacking. Hopefully, with a sequel they make a much better story.
Why? Because I'm at around 600 hours played and still enjoy it. The free online has been phenomenal and I am quite sad about the servers being taken down already this summer. The single player campaign was pretty good and typical JRPG fair but the online questing, guilds, georamas and everything else included made this game quite awesome for long term playing. Most time I've spent with a current gen game easy.