FearMonkey
Vault Senior Citizen
The main thing I'm worried about with an open world stealth game is that it's either going to make the game too easy or I'm going to break the game too easy. At least in previous games the levels were designed around specific ways of getting in and took account different people's play styles (pure stealth, run & gun & CQC, mixture of both). With open world, though it's probably still possible to do that, it's also easier for the designers to accidentally create holes in the level design and allow players to exploit them. That's mostly what I'm worried about.