Asperity : Im only calling you out because you made a specific point I'd like to address. There is no meanness intended.
In certain end game raiding guilds what you are explaining is what one would reasonably expect. If a dps class is assisting the group, their dps will suffer. Kiters' dps will suffer.
Having been up to ICC (not clearing as I quit before then), I can truthfully say that regardless of what reason would dictate-people are still people. And people can be very unreasonable.
My friend *is* in an endgame guild, and even while I've watched him take down the LK, he's constantly harping on damage meters for ALL fights. He's a hunter sometimes, and sometimes a pally tank/healer. It depends on what is needed.
It's enlightening to hear how he talks about his fellow players in his guild. How he measures them by their dps only. And it is not just him. Everyone in his guild is like that.
People in my guild were becoming like that too. Leaving out guildmates that did not 'make the cut' as it were.
Now what does this have to do with your point that reasonably one would expect dps to fluctuate depending on the fights? Merely that in practice, theory often goes out the window.
If your guild was not like this-my hats off to you! You had found a truly unique and beautiful thing.