I've been yelled at for both. Though to be fair, I was only yelled at for my Slaying set a grand total of twice (and one of those I'm not even sure if I should count, because obvious troll was obvious). My FC healer prefers me to wear Fending most of the time in dungeons, but that's just because she is actually able to capitalize on the extra room my increased HP provides to heal more efficiently and spend more time in Cleric Stance spamming Holy (which, as I main PLD, actually makes for a lot more DPS).
I will say that this change is going to cheese some of A1S-A4S. With the additional 30-40% HP from full Fending, it's going to be kind of silly to see how little damage the tankbusters do by comparison. I just hope the 3.2 instances do proportionally more damage to compensate for this, or else Ex Roulette and Savage raiding are going to be incredibly boring.