Randoms being uncooperative?

So like most of the community I PuG. I do my Randoms, and enjoy tanking. Recently however I have noticed what seems to me as a contradiction.

Everyone likes things to move along quickly, I personally don't want to spend all day in an instance, anymore than the DPS or Healers do. But it seems that lately players just want to arbitrarily chose a target and leave it up to me to control their aggro. I've gotten a few excuses that range from "ur bad" to "I'm used to a Paladin/DK tank" . Meanwhile if i mark up every pull, I'm told "you are taking too long" or "gogogogogogo"

As I stated I enjoy tanking, but I'm starting to feel jaded. The target I'm putting my attention into i don't ever have an issue with threat. As for AoE threat, I'm not the type of player to complain about imbalances in classes.But I'm not a DK or Paladin, as far as I know people are aware of warrior's AoE deficiency. So I'm really just looking for feedback. Anyone having this perceived issue? I feel really bad letting someone die to the mob they feel inclined to tank, but tabbing around to taunt everything seems to be rewarding bad behavior.