Title should say it all. The machine gun is a nice power weapon to balance out the serious lack of assaulting fire power, but when the entire attacking force can take one, it throws off the entire fight.

A single gun per map works, but then you play on maps like "Liberty Island" and you have 10 lying around.

On similar note, the location of some terminals can be hacked without any chance for the defenders to take it back. I'll point out Downed Bird as the primary example (since very time I look for a game, DB and Wall Street are the only starting options), point A (the highest objective) only has 2 access points. To add to this specific location's problems, there is a mounted gun 30 feet away from it, which can 1-shot anyone coming in from those doors.