Oblivon and Fallout 3 were great, but Oblivion's leveling and loot system sucked, and Fallout NV is much better than 3. Skyrim looks absolutely amazing though, and it sounds like that crappy leveling system is gone, so it'll probably be top 3 if it's as good as I'm hoping. Mass Effect 3 will probably replace 2 when it comes out as well. WRPGs this gen have been absolutely amazing, though it is a shame JRPGs have been kind of lacklustler on consoles.
Not changing sig until Half Life 2: Episode 3 comes out