Most of these titles didn't turn shit because of the X360, however I believe FFXIII did; I don't care what you say. Actually, it's the only one I can point at for that.
GTA IV: yes, gtas have been on the xbox before so they won't really be called exclusives but they sorta went "exclusive" with MS this gen and we all know how GTA:San Andreas is much better than it.Yes it sold really well but what about the game quality?
TEKKEN: This is the fault of the developer for not upgrading the game from a few years back. Maybe if they had stayed exclusive, Sony would have forced them to.
MGS Rising: Yes, there has been MGS on the X360 before but for the most part, MGS is a Sony exclusive with MGS IV taking us all by surprise. I doubt MGS: Rising would come close to how epic MGS IV was because it's multiplat which means they can't just focus on one engine and also Raiden is the main character so we'll see how that works out.
P.S.
I'll add more if I remember any other games. I had a list. Just can't find it or you can let me know what I'm missing. Thanks.