That's just my zombie bias creeping in. Still, RE5 and 6 could have both been better.
I honestly felt Journey ended perfectly and I really can't see a reason to delve back into that story without wrecking everything else the first game did well. Braid also strikes me as a game that really doesn't need a direct sequel. Spiritual sequels could work for both but they don't really need sequels. Same deal with Team Ico's titles, I just feel like trying to add onto those would result in losing something from the original.