I love games when you can rely on stealth as your utmost quality.

Even better is if it takes place in fantasy medieval times.

Such as Siege of Avalon.

Focusing on stealth, one can use bow and arrow for one-shot kills if your enemy does not know you are present.

And focusing on stealth (making it reach 50 in Siege of Avalon for example), you can run around enemies without them knowing you are there, then pluck them with an arrow while right in front of them.

If anybody knows of any game where stealth can help as much as this, I would greatly appreciate a couple titles of these games, preferably for PC, if not, then PS2.