I'm pretty sure that every champion who builds more than 2 health items is going to need buffs.

Since a significant portion of champions build defensive items, and since a large portion of the power from most defensive items has been placed into either one or the other type of damage mitigation, a large number of champions are most likely going to need buffs. More than just tanks, basically every bruiser in the game is included.

This is mostly a quick observation post because I'm tired so don't go freaking out on me about stuff I didn't mention. Keep it civil if possible.