Apologies for continuing to harp on about this game... but Metro 2033 has some elements that are so well done. Particularly, the stealth sections (which I'm pretty sure are optional, but when ammo is pretty scarce in the game generally it makes sense for me to want to conserve it - plus I like stealth games) and the sound design of the game.
Simply put, the sound and stealth mechanics are incredibly close to the original Thief games. The way you manipulate darkness to sneak around, and have to be careful with what you're walking on to avoid giving yourself away to the enemies. The downside is... if you get caught then it seems like everyone around magically can immediately find you - which is fucking bullshit. But it's not a full fledged stealth game. I am finding myself enjoying sneaking around and throwing knives into peoples heads though. The original Thief games are among my favourites of all time though.