Honestly it's best not to read the replies, because the thread quickly devolved from "why should you mark", which was just a catchy title, to "all dps should dot absolutely everything all the time", which relies on some skewed math, the presumption that all targets dotted are going to survive for the entire duration of a dot, and other givens that don't reflect common dungeon conditions.

This thread is about ready to die. Marking is a good thing. Complaints about how DPS behave should go to the DPS forum, imo. =)