I've taken 2 groups of 3 DD through floors 41-50 with no problems, but then again I'm not stupid and do not pull more than my Cd's can handle.

For example you get those rooms full of mobs going in and pulling them all with a good comp is well just stupid, can you guarantee you wont trigger a trap and be fucked.

The runs were not that much slower, maybe faster then ideal comps, sounds like you got someone who in my opinion has no right to be playing the tank role.

If you had a AST and a WAR wouldn't that mean the other two roles really do not matter ? Makes no sense to me why they would try to wipe that run.
I admit I have straight up left a group on floors 31-40, three DD group again but they are doing what your War did to you, I asked them to stop and let me do my job because a faster run. they carried on so I left and made coffee.

Sounds like ran into a double duo of bad, you have my condolences
all we can do is move on and pray it wont happen again, I see a lot less of this BS because I tank but as I said earlier i'm not immune to also getting idiots( not bad players just idiots) in parties.