I have to disagree with the above. As a low level and endgame tank I've managed to hold or take back hate fine. I rarely mark targets and while prefer that they choose and attack the same target I'm not enforcing it because it's not marked. HOWEVER early pulling is something I lack tolerance of, if you want to do my job go ahead. As a healer or tank I will inform the offending dps (often ranged DPS, ARC/BRD). If it happens at the next pull I will leave that mob on them.

Consistent early pulls might save maybe one or two minute in the end but it's not something you should inconvenience others with. There ARE bad tanks but dps already have it easy during low levels. Very few (if any) mechanics require the boss to be dps'd within a certain amount of time. Being bad is one thing but not liking a tank's style is another. If you want the job done right then do it yourself.