GS in heroics doesn't matter. If you're level 80 you're ready for it. I also don't mind clueless dpsers as long as they listen, had a warlock the other day with defense rings and AP staff, I did 50% of the party damage that run on my warr... Didn't mind it too much though, was a bit slow but that's it.
On the other hand healers that pull and crap get on my nerves so I voted for this.
As for bad tanks, I'm mostly tanking so don't have to put up with them