I retired my human paladin, due to the Human Versatility, aura and divine favor nerfs. -5 UMD doesn't equal a clicky replacement. No need to start a HV nerf discussion, it was enough for me to quit on that toon. imo they totally gimped paladins and made them into not as good a class as they should be.
I also retired my ranger, as ranged combat was smacked down hard (whether by bug or nerf I can't honestly tell - though I think its some of both). Yes I hear mod6 claims to 'fix' ranged combat, but have no faith in this one ever working.
One might call the vorpal nerf a vorpal fix - i'm sure to the guys using vorpals at the time it was a nerf in their minds. You could argue most game changes are "fixes" as there's a lot in the game that doesn't follow the PnP rules.