Fallout: New Vegas for me.
First time, I didn't really think too much of it. I kinda just rushed through the game for the most part.
Almost two years later however, I decided to give the game a second chance. And HOLY SHIT. I ended up loving it.
I took my time and did a bit more exploring, got a better understanding of the game's story and various factions. And it was really fun to play.
Sure, the game was still kinda buggy, but the good far outweighed the bad in this game.
I ended up playing through the game at least four times. Two of which, I went for an Independent Vegas, another for House, and finally one for the NCR.
I even downloaded all the DLC packs for the game. (minus the Gun Runner one) And they were all very fun too. I probably liked Dead Money and Lonesome Road the best out them all.
The game even got me to download the first two Fallout games for the PC. And they were great games as well.
I might do another playthough sometime, perhaps when I'm done with Chrono Chross...