I mean if you're GOOD and have a decent partner you should be able to hit top 10 regardless of class. Maybe less likely as a warlock / mage though, but you can outplay people mechanically with CC heavy comps if you set up burst properly and communicate well.
I really don't recommend running anything other than double hybrid or heal / dps if you plan on playing against shit like double brew, ret or enh offheals alone really can't carry two people long enough against high dps with survivability. Ret / Enh is also quite potent.