Decent 2 no game before it and no game since has that same "there is no such thing as up" (aside from sci-fi combat flight sims)
Mostly the older ones. Adventure games are great, but I have been playing classic Doom lately. I stopped after it kept messing up the resolution on my computer.
This would have to be.. Fallout 3 and Oblivion by Bethesda, as well as BioWare's Mass Effect (1 & 2), Dragon Age: Origins and Knights of the Old Republic.