This is mostly true. Either bad DPS or bad healer makes the tank role annoying to play in pugs.
I've been playing as a tank bot since 2.0. It's not stressful on my end, but annoying to play when the DPS takes forever to nuke the trash or the healer is idling behind. My complaint is more about the DPS, though. When I play healer, I DO! call the tank out if I notice they aren't using cds. However, I'll assume the responsability if I, for wahtever reason, caused the wipe.
