I've had a healer that couldn't quite keep up before. I usually don't get onto them, because I also heal and I know how crazy it can get if a tank doesn't keep all the hate. People need to wait it out before deciding someone is inadequate at their job.

I've been blamed for everyone dying as a tank when I knew it wasn't true, but there's been a time when it was true, so I know both sides.
Everyone gets a little defensive because they all assume it's a little their fault, I think.

I wanted to start being a dps just so no one would yell at me lol.