I've forever told people that I don't mind if people mark for me, because I never do it. I find it makes fights a little more interesting and it sort of shows how the group is too. Honestly, sometimes the groups I get through DF and Roulette pretty much give me the idea that it wouldn't matter anyway because they spam AOE like nothing else because everyone wants to speed run. If people are that desperate to get DPS IMMEDIATELY and not wait and see where the damage is going from the pull, then that's their problem.

(Also, I'm on console and targeting isn't ideal. It's either luck or time to mark them properly.) and admittedly, I'm lazy and have yet to make the shield throw targeting macro thing. I've never had a problem holding aggro, marking or not.