The problem I see now is that most people can't be bothered with CC.
I always get asked, what's cc?
Which goes to show you don't know your class, especially in HM.
Unless you are confident in burning down mobs within 1 or 2 aoes, kill weakest to strongest.
Its not hard to understand how less mobs, mean less dmg overall, regardless of how many there are or their mob type.
Tank(s) will always focus on the strongest, DPS focus on the weakest.