Not as great as past halo games
the combat dosnt feel as smooth as previous halo games and the graphics seem to be more bland. when i say bland i mean more like borderlands. yes the game is full 1280x720 but in doing so it lost some quality in lighting and graphics. you can tell by playing halo reach and then halo 4 its very notable.
The Ai overall seems to be worse for allies as they are more like storm troopers now than in previous games missing shots and acting stupider than usual. for instance in previous Halo games if you are driving a warthog and come upon an AI soldier they will immediately jump into the back turret. on halo 4 they all fight over the passenger seat and don't seem to notice that the turret is even there.
Level design is another problem as well. i like to explore as much as possible before i move on to the next point but in doing so i quickly loose my bearings and cant tell which way to go. many levels look the same no matter what side you are on most of the time everything looks like a copy and paste from one side to the other with small variations. again unlike previous halo games where if you wander around for more than a minute or two a way point pops up it dosnt happen on most levels in halo 4 and you are just left wandering around till you find your way to the next check point.
and last a lack of consistency in master chiefs size and personality. in previous halo games you could tell you were in a 7 foot tall man ready to kick ass but in halo 4 its like master chief has shrunk. you are never looking down at anyone at any time you are the same size as anyone though in cut scenes master chief is seemingly back to his regular height? i find this strange as well as disappointing.
As for his personality is has been more vocal and emotional on previous halo games than in halo 4. he may not have been mad or sad but you can tell that 343 really never paid attention to how he acted in halo 2 or 3 because he showed alot more emotion in thos games than in halo 4 which also disappoints me
Overall i give it a 6.5 Just because the multi player is fun. i think 343 needs to re evaluate how they make halo games in the future if they keep going down this route its going to turn into a very weak story experience and wont be worth playing. (though its not even really worth playing now)