If any of you are struggling with the Generator Defense firefight gametype, this is what I suggest:
-Always have the Drop Shield armor ability
-Set it to only 1 generator. If you are playing with friends or family, make it 3.
-use the DMR or Assault Rifle for the smaller maps (such as Corvette, Unearthed, etc etc) and the sniper rifle/needler rifle for the big maps.
-Only lock down the generator when you are fighting Hunters, Fuel Rod Generals or Fuel Rod Grunts
-If you have more than one player, have them stand in front of the generator. The Drop Shield is extra insurance against losing the generator.
-Honestly, I don't care what your weapon damage, ammo capacity, shield strength and damage resistance are. Jack it up as much as you want for all I care.
-Finally, play.
If you're playing solo, and you have 3 generators, you will lose 2 generators, I don't care how "skilled" you claim to be.
On a personal note, I might play this once a week. It's... ok, but I see why it wasn't added to Matchmaking.
[Edited on 11.09.2011 10:35 AM PST]