You're right What ever works for the individual playing.I gave up on the silent approach mainly because I could'nt take out the flare people quick enough.I made it through the level by just barging in quick with my squad and shooting everything in sight but you definitely need to keep hitting the health reset before going into each camp.some camps took me 3 tries but eventually I made it through them all.
Well...not to brag but I beat it without any cheats or trainers or anything like that for the 360, I find it's unfair to claim you've beat a game without beating it with no cheats or trainers or tricks of the sort