Watching Drew play MGS has given me such confidence in my own stealth abilities. I thought I was terrible at stealth games, but I also don't think I saw the war rage mode or whatever it was in MGS4 and I played through the first 2.5 acts of that game. He got into that state in the first episode of his playthrough if I remember.
I've never used grenades in MGS3. Drew really opened my eyes.