At the risk of sounding condescending; why are you responding to a thread that's over a year old and quoting a user that (to my knowledge) hasn't been on this site in almost as long?
That guy has been on this site.. waiting for his answer.. he didn't want to be rude and ask again so he just sat ther, waiting….
This game was awesome, I chose to play my first play-thru on veteran, that was a trip, not only was it hard as hell but I had to figure it out as I was going through it all. Man that was a lot of fun =]
I cant wait to make a video guide to this game its so easy i did it in one day on two different psn's and for a friend the trick is to just poop on as many people as fast as possible throw grenades then move up to new cover and run over bodies while spraying right to left the a.i. response is good because they respond take advantage of it and you will succeed