I've been playing Fable II for about a week now (maybe 8 hours), and after getting through the excrutiating introductory portion of playing the protagonist as a child, it's been entertaining enough so far. Plenty to criticize, too, but right now, though, I'm just posting about the game to say that it would be pretty awesome to take a game like Fable II, with its relatively open world, leveling and skill tree (sort of), character customization, etc., and replace its simplistic combat system with something like the one from Ninja Gaiden (2004). Maybe a better idea would be to start with a game like Oblivion (with its much more detailed and more open world), and add in a really deep combat system.
Anybody know any games like that I've missed? I can't think of one.