The GV play in AH3 is different only in that you can't camp behind a berm or obstacle unless you're on a base. No more 85 spawn with the hill, the bridge, and all the berms, away from a town or base. Same with the old 135/136 spawn, and the 26/28 spawn areas, and the valley spawn areas (can't remember the map names off the top of my head). Those were tremendous fun. Camp behind a berm, fill the pipe with crack, and have at it.
No more of that. But, there is definitely something to be said about the quality of tanking around the GV fields and towns in AH3. I think in that regard, the GV play is better.
I put on the wishlist a few months ago for Hitech to create new objects for the map makers to drop into their maps. Namely the old style bridges, berms, and barns. That way a map maker can drop in those objects wherever they wanted between spawn areas, or around a field or in front of a town. Doesn't seem like it would be that hard to create or insert. If you can drop in a tree on a hill, why not a berm. Put another way, if you can create a slab of terrain and bake in buildings, and traversable curbs, gun pits and small, steep hills and call it a town object with stuff you can drive up to and over, and then drop that town object in a certain spot on the terrain, why not create a slab of terrain with baked in berms, small steep hills, barns, bridges, and trees on them, and drop that in the terrain near a spawn, or between spawns.