Why I don't like most stealth games is because they just feel tedious and slow. I hate waiting around for guards to look away, lasers to turn off, etc. A stealth game would be a lot more fun without all of this waiting around.
That's where Stealth Bas**** comes in.
http://www.stealthbastard.com/
I haven't played it yet, but it does look very good. It's very fast paced and the game describes itself as Metal Gear Solid and Super Meat Boy's child. It's also free of charge, and it comes with a level editor. I'll try it out after I get back from a brief trip, but I thought I'd let you guys know of the game's existence.