There are things I like about it, and things I really dislike.
The desert textures are a nice change of place and look quite good (a little grainy down low, but no biggie).
And I've enjoyed several exhilirating canyon fights, quite fun. I have no problems with the altitudes.
The things I dislike, are not any thing about this terrain, but a function of a terrain this size with this many bases.
Its almost impossible to find a fun fight. With the fights spread out over 7 fronts, and about 100 pilots per side, everyone spreads out and starts milkrunning bases. If one side gets even a slight disadvantage, the side thats even slightly down, just moves elsewhere and attacks where the enemy isn't.
So either I'm attacking the enemy with a 4 to 1 advantage (no fun), or I'm fighting at a 4 to 1 disadvantage. And thats no fun either.
Its not the terrain, its the number of players, and how we're playing it.

Maybe a different starting setup would help, where each side starts with one sector?