I rather enjoyed the loadout's.
It allows you to start with your style, new players tend to do better with the assault rifle cause it's just shoot like crazy, rather than having to worry about precision.
But for those who do have some precision you still have the variety of models, Battle Rifle? DMR? Carbine? And then there's choosing your spartan power, your grenade and your preferred pistol as well.
Gameplay wise my main complaint is their kill streaks. An obvious COD rip off (Load outs technically was too, but at least it had some benefit) which completely screws over map balance. Now any player can get a OP weapon if they gain a few kills. One of the charms of earlier Halo games was watching the whole team fight over the one energy sword or rocket launcher on the map. Not anymore. :(
The story... bleh.
I have a number of issues with that.
1. Master Chief talked way too much.
His main charm was being the quiet bad ass who spoke little words. Halo 4 felt like they threw him into a Shakespeare play.
2. The Villain
He shows twice... for like a minute each. The first time he pops out of no where goes "Hi, I'm a villain, Grrr!" and leaves. Never coming again until end game where having only seen him for a minute you wouldn't care for him at all.
3. The way they told the story
Having to cram your entire story in a two minute rant, through from vision from a God woman was just the laziest form of writing and story telling I ever saw. Is it too much to ask for gradual story progression throughout the campaign? From characters? It is? Ok.... fuck you Halo 4.
4. Covenenant is
EVIL!!!They already resolved this, the Prophets were gone and the Elites were good with humanity.
Now apparently the Arbiter become totally incapable in finding his lost bretheran and elites are now evil because... people want to kill elites?
5. The new enemies are cheap
The Praetorian's were cheap as hell, spawn out of nowhere and have the ability to kill you in one hit, at full health.
They weren't a challenge, they were "How many respawn's until you memorize where they are" sort of threat.