I'm an i91 WHM and can heal SRs of Brayflox with my FC just fine (including doing Holy rotations for additional DPS), but if I hit roulette? Generally it's a nightmare attempting to keep up.

99% of the time I run into tanks who won't pop cds and just eat AoEs on the trash pulls, then I get yelled at for either not being able to keep up with heals, or for not using Holy. It's like "Dude, I was busy attempting to keep you alive, I didn't have time to drop into Cleric Stance and start spamming away at Holy."

I'd much rather attempt a speedrun of Brayflox with a lower iLvl tank that actually knows to use their cooldowns than to run it with someone in i100 gear who thinks they can build hate then walk off for a snack until the mob is dead.