Speed Runs Suck

[Unglitteringold]

you could, I dont know, ASK THE GROUP IF THEY ARE OK WITH BIGGER PULLS. genius i know

Sure, and what happens when they say, "Yes. Pull big," and then suck? Then they blame the tank for sucking, or the healer for sucking, and things are bad. Just because people SAY they are okay with bigger pulls doesn't mean they can actually handle bigger pulls. Not everyone has an accurate understanding of their abilities, and not every group will instantly be able to click into a rhythm and work well together.

[Februs]

Sure, and what happens when they say, "Yes. Pull big," and then suck? Then they blame the tank for sucking

If you enjoy tanking, then you'll have to get over this. I'll give you a veteran's tip. The tank gets blamed for EVERYTHING. It's just a common thing. Dps never blame themselves for being too slow (and hardly know if they are too slow because parsers are illegal in game), and healers like to cover their asses. Some are good. Some are bad. Some think they are good but can be better.
If someone complains about your tanking you only have TWO questions to ask yourself. 1. Did I hold aggro? If yes, then you did 90% of your job. Congrats. 2. Did I do everything I could to mitigate the dmg I was receiving (ie. pop appropriate Cd's, buffs etc.)? If yes, then great! You did 100% of your job and the healer and/or dps just suck. If they complain, who cares? You know that you did your part as well as you could.