Played Snake Eater way back, actually was the first PS2 game I actually completed but a MGS game isn't what I'm looking for.
IMO (loved MGS4 and Snake Eater) MGS isn't true stealth. It is just too easy to play action-style. Personally I prefer Splinter Cell; creeping through the shadows is what I consider pure stealth. Too bad most games have abandoned that light-shadows based stealth
So basically any good stealth games similar to SC or Hitman Blood Money (not Absolution)