1)Splinter Cell Series(Especially Chaos Theory.Love that thing.Didn't really enjoy Double Agent)
2)Hitman Series(Either be normal stealth or diguise stealth)
3)MGS (I only have 2 and 4,and from what I've played,4 is more stealthy)
I say Splinter Cell is superior to the others,Hitman being the equivalent.MGS is a great game and all,but for the most part, I went through having to blast everyone away.Especially in 4.There was never any penalty for being caught as far as I know.You just had to hide, then it went from Caution to normal state. Splinter Cell however(for the most part) had an alert system, forcing you to think ahead and pay attenion to your enemies. Also sometimes, you didn't have the fifth freedom, so the option of death was out of the question.
"You know when you get your report card,and you have all F's on it,you should take it back to the teacher and say "Throw some D's on that bitch!" "