I think that the DPS are better quality at least in DF for the new 4 mans. Aside from better gear, the progressive players are out in force trying to cap their soldiery. It seems to me that in even before 2.1, and not soon after, most of these same players were already geared out and may have only appeared sporadically in DF doing dailies. In 2.2, I've seen high DPS parses more frequently when using DF or doing expert daily. With that said, any lost hate seems easily recovered though, and its mostly a stray mob in a big pull like in Brayflox. I have not yet noticed healers pulling more hate in 2.2 in the 4 mans.