Any games similar to Metal Gear out there?

I'm a fan of the Metal Gear series myself and have been since the first game for the NES many moons ago -- back when hiding under a cardboard box actually came in handy. I've tried (and disliked) the Splinter Cell series too. There are a few games I've found however that have different settings -- which is to say you're not a cold warrior on a stealth mission to save the world from terrorists -- but they offer similar gameplay, similar wheels-within-wheels storylines, and an emphasis on stealth over combat. I would strongly recommend the Assassin's Creed games and Batman: Arkham Asylum. Again, neither puts you in the role of a special ops guy like Snake, but both series of games put you in control of a bad-*** character who operates mostly by stealth and subterfuge.