I also agree with a lot of the things said already.
The most annoying aspect of Halo 4 is the multiplayer. I can barely play it because I find myself being cheated by ridiculous lag, glitches, or just general gameplay problems that make the game impossible to stand.
It is MUCH better than having to deal with Halo: Reach multiplayer, but still, absolutely awful. The ranking system is horrible, the fact that they didn't even include all of the specializations at release is completely idiotic. Not to mention the epic screw up they created when trying to send them to everyone. Unbelievable. You'd think for a multi-million dollar company they could handle sending emails.
I do not like what they've done with the multiplayer at all. Feels way to much like they're trying to implement ideas from CoD, ideas that aren't even good. Why I always picked Halo over CoD was the fact that you could go into a game as equals, and the better player would win, based on skill. Now its turned into the player that can run to the Warthog first, or the player that picks up the incineration cannon. Seriously, where is the fun in a game where there are weapons like that, there is no way to dodge or counter some of the weapons.
Also, the sniping has changed, A LOT, and not for the better. It is twice as hard to snipe, and half the time when you hit them in the head its not a one shot kill. You have to aim around the neck to get a proper headshot. This is silly. It takes out all of the fun of sniping, which is to get headshots (IMO).
Halo 4 is a game that caters to noobs. Thats how I see it. Heavy vehicle use, cheap weapons. Don't even get me started on the bolt shot. WORST WEAPON EVER INVENTED. Its like starting the game with a shotgun. How does that take skill?
I miss the old Halo's where it took some skill and experience to be good at the game. Now its just not fun at all. Infinity Slayer is the worst game type of them all. Absolutely awful, crap. I can't believe I bought this game, and thats something I've said twice now. Halo 4 and Halo: Reach have really decreased my respect and love of the franchise.
There are things that I think 343 did right, but so many more that I don't. I can understand why some people love Halo 4, but I just think its awful. Multiplayer isn't worth the time. Really hope they change most of it in the next one.