Damn. I was going to say 90 for Halo 4 because it kind of follows a pattern for the main series (97 -> 95 -> 94 -> 91, excluding remakes, half-games and RTS'), but I thought that the hype & talent behind it may drag it a little higher and put 92. Oh well. Still plenty of time for it to gain metascore I suppose.
Almost there with NFS, miles off with both Assassin's Creeds though, bleh.