The main reason I don't tank anymore is because I'm behind the curve and my ping is terrible (I have 25% of the attack bars to get out of the aoe) when on american servers. (I don't speak or want to play with primarily japanese people, bad experiences.)

The reason I stopped tanking originally was because I'd run an instance 15+ times to get my guild their gear and I do it again to help out one of my healer friends I made and I would get hotshots who refused to listen to my simple orders. Such as attack my target and stay behind me, being the primary ones. I would also have to deal with warriors who refused to offtank when I flat out told them I wasn't experienced enough (or with good enough ping) to handle all the extra adds. Ultimately it came down to ping and being unable to give SE my money due to their strict address requirements and (at that time) their horrendous support.