Try playing a few missions of N64 Perfect Dark and then switch to the 60fps, 4x FSAA, 1280x720 Xbox 360 source port....
Good or bad? I don't have a 360, so I cant try it out. Honestly though, I never considered Perfect Dark to be a great looking N64 game, and same goes for Goldeneye. Both were exceptional games for their time, but I didn't consider them great looking games even back in those days.