I use it a lot but common is the only thing the assault guy has! poor guy is almost useless if you don't know how to play, scout can be invisible almost the engineer has great tool equipment and the assault? lol please don't complain about the ammo box ask for more equipment instead.
The ammo box is fine. after 2 or so refills it takes 2 minutes or so before you can restock auxiliary equipment and the like. and since the game rounds aren't that long. Besides it's a tactic that isn't limited to any particular team
There is a counter for everything.
Learn to play the game. Get better. Before you start whining, asking to nerf something. :-)