I agree with both of you to be honest
Epitaph is a terrible map for anything other than 2vs2. Otherwise you get someone around every corner+shield door camping with either a shotgun/hammer or camping up on top of the pillars with rockets.
I only really think of the maps in terms of 2v2 as 4v4 is a monkey **** fight no matter what map it's on with Halo 3.