Gonna update with a much more detailed impression of the Halo 4 multiplayer here.
Multiplayer Only - 8.5/10 (I'm sure this will improve with a few updates)
After playing another 6 hours or so I've come to remember why I love this series so much. It's always just a great experience. Things change, but it all still somehow feels the same without being stale. I can tell this game is going to consume all my (little) free time for at least the next month or so.
Smoothest online experience I've had in awhile. Hardly any lag so far on either end. Well balanced matchmaking (as expected) though I think it could slightly sped up. Once you get into a game they come fairly quick, but it sometimes gets held up finding players.
I may be jaded from having top notch graphics on PC, but I'm pretty unimpressed with the visuals. Didn't bump it down any points for that though because when put in perspective (console gaming) it's gorgeous (blows BLOPS 2 out of the water).
Everyone was right about the sound design. The only problem I've had with the sounds so far is with the new BR sound. It just sounds wimpy. The new AR on the other hand...holy crap. Magnum sounds awesome, DMR sounds hefty.
Now this is one of the things I knocked off points for (and it's one thing I'm sure will improve). As far as I can tell there's only a 'big team slayer' playlist rather than 'big team battle'. You can select the different objective based playlists, but my favorite thing to do was always BTB as you got a good mix or Slayer, Snipers, CTF, KOTH, etc. The max team size has also been reduced (for better and for worse, IMO). Full point there.
The other .5 point I docked were due to the fact that the 3 forge maps aren't in the playlists at all so your matchmaking experience is only 10 maps at the moment. While I don't mind any of them in particular, it's frustrating to know that you've got 3 perfectly good maps sitting there being useless. Again, this will be fine once the new map packs hit (and I can't believe I'm saying this, but I think I'll be getting them all).
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This game has made me remember a few things. One of which is that once you play PC for even a few years consistently console shooters become somewhat ridiculously easy (for the most part). I placed first in my first ever game by over 10 kills. The last game I played today (sitting around level 20 at this point) I went 23 and 2.
Some people might not like this as it feels 'easy', but Halo has always kept it frantic enough that even when you're doing well you still feel like you're being hunted down. As opposed to the COD franchise where you feel like a god amongst men.
The other thing it's reminded me of is how much I missed videogames. I haven't picked up and controller or used a mouse to play a game consistently in over a year. I played a little SC II and Diablo III and that's about it. With this release though I'm back in the game. I've lost faith in the COD franchise completely, and with game I've completely regained my faith in the Halo franchise. Screw Bungie. Keep rockin' it out 343.
Stomping nerds is just too much fun to cut out of my life forever.
BONUS:
Enjoy this fantastic, chill remix of one of the songs on the OST.
http://www.youtube.com/watch?v=G5xJDYClnTA