Tanking is a strange and mysterious beast now.
The culture of world of Warcraft has been infected with the randomness/anonymity of the internet and that has really caused trouble. In an effor to try and get used to this I picked up my 70 Dwarf Paladin, got geared up, and sent into the Wrath instances. After 5 runs Im now 71 and boy...ponies..
So lets start in order.
Round One, Fight!

Theres a Death Knight DPS who is a level higher than me, but has such lousy gear hes only doing half my damage. After someone pointed that out he starts taunting mobs off me and then complaining im not holding agro. We aren't talking about being subtle ether, in one fight he was running away from me and pulling the mob after him when I taunted it.
Verdict: Kicked, added to ignore. Bonus points for kicking him just before the final boss.