Speaking from a 10 man point of view, you usually only have one of each class. You cannot compare a warlock to a elemental shaman, for instance. The point remains, if you're doing less than you could be, you're still being carried. Not doing your best because your average is still better than the rest is just a poor attempt at a very bad excuse. And the OP isn't doing his best in any way, judging by his armory.
From the log that was helpfully provided...
Spent 10% of the fight standing around probably telling other people they were shit and 73% uptime on his only dot. I'd have kicked him too.
Although, if he can't monitor Immolate, then he can't play affliction either.
Let's not dredge up old and tired discussions. OP was answered long ago.