In very low content, the party is 4 dps with healer offhealing just in some case. Tank aggro skills are quite nonexistent and tank should not care much the mobs pulled off him. Just take focus one mob and try keep pull on others but don't care if some dps pulls them off.
High level players are able to finish mobs off without issues so if they blame tank is only because they want make some lol against him and they can be ignored.

When I go brd on low content I tell tank to ignore the pulls I do because I am quite able to kill mob without issues even if mob touches me.