I finished the Halo 4 campaign on heroic at the weekend..
To summise it was a good play, I enjoyed it.. maybe not so much as others, but it did have a high bar to beat..
3 Best things about it..
1) New enemies kick ass.. blend in perfectly to the game and add a new dimension to battles
2) Graphics are top notch, the hollywood cut-scenes are very impressive too
3) The new vehicle (Mantis) is effin cool..
3 Worst things about it..
1) They didnt get the guy who did the other halo scores.. so no halo anthem and a pretty dull soundtrack and some dialogue seems missing (the covenant mainly)
2) QTEs suck balls.. no need to put them in, granted they are only in 2 places.. thats 2 too many though.. and having one at a crucial point in the game was just.. blah!
3) It had too many levels based on a ship.. and so some levels felt too linear and the objectives felt repetitive.. most of the levels are fun to play.. it was just missing one EPIC level though
Haven't played the multi-player yet.. im not in a hurry at the moment.. bit concerned about reports that a lot of it has changed and used some COD mechanics
So I might actually replay the campaign on legendary before I start on the MP. Spartan Ops sounds great though
I hope 343 can take some fan criticism on board.. they have done a pretty solid job with Halo 4.. it just needs slightly tweaking to be on par with the best that Bungie did