Mine...
Mass Effect Trilogy (2, 3, 1. In that order.) Mainly because playing the first game is a chore for me. Despite the strange audio cut offs on the end of a sentence (at times, ps3) in 2, it's still my favorite.
KOTOR... never get sick of it. And I know Obsidian did KOTOR II, but with the story patch that someone did for it... might as well give it a shout out.
Dragon Age (2, Inquisition, Origins) I like the story in Origins better then the other two, obviously. But I've played it so many times, the combat is slower then how fast I want to move 
SWTOR. I liked the class stories, but not the mmo aspect of it. It was a still a good game though, enjoyed it... even subbed for a while! But only because I was tempered by years of playing WoW.
Jade Empire. I liked it, but I want a sequel, dammit!
I haven't played Baldur's Gate, either one. Mostly because I tried to play, and my computer was like... 'lolno'. Then again, my husband still has the original disc versions and that's what I installed. So... maybe I'll buy them on Steam, or something.