I agree with SkeptiK,the City gun circulation is good,but outlands is terribly unbalanced.
Though after the update to the Outlands map, I've seen less weapons on the ground.
Ammo is still as always... Refusing to show its face to me. Almost everyone on Outlands who has ammo donated.
I'll probally be donating in the near future for some pistol ammo. My shotgun is lonely 

Depends really. Sometimes it can be more dull then the city and or more actiony. Depends on who is on and your play style. Ammo is really hard to come by ...