The complaint I have is an easy fix for 343 to handle but, suffice to say, it is easily the worst I have seen since Colonial Space Marines (and that is saying a lot - those who played it know what I mean) and that is the AI standing directly in your path of shooting constantly. Outside of that this game is outstanding but that is absolutely atrocious in its current state as they, constantly, take position directly in front of your line of fire and this becomes even worse when you are in a vehicle and they are in their own. C’mon now 343, you delivered a great product here so tune that over the next few weeks.
Yeah I did pick up on my first play through of the campaign that there was several times that I would be shooting at an enemy and one of my team mates would just casually stroll straight in to my firing line and then have the nerve to tell me to watch where I am firing 
Even though the developers said you could play without the command system, I think they made the game hoping everyone would use it. I played the first mission without the command aspect as I was trying to get used to the thrusters and groundpoun stuff (still not comfortable with it yet). After the first mission I got tired of them wandering aimlessly so I started commanding them where to go and the experience got better. I didn’t have a problem with it after that for the most part and was comfortable with it. Then again I was a huge fan of Republic Commando so that prolly helped.
Yes, the spartan super soldiers can’t figure out how to actually fight and take cover, unless you babysit them and keep telling them to move forward or target someone… really pathetic AI on them
When I picked up the Mantis they were just constantly driving directly in front of the firing lane with a damn Mongoose or such. Toward the end I just shot through them but this is a fairly easy fix so, hopefully, it gets sorted out.
I didn’t really have this probably, maybe commanding them helps.
Commanding them is pretty necessary tbh, they seem to increase their ROF when commanded too I notice.
One thing which bugs me though is their heavy weapon use, they seem poorer than previous game Marine AI. Give a marine a sniper or rockets, laser etc, you know he;'s going to get himself a fair few kills if you watch out for him, where as I commanded one to take a hydra launcher (didn’t realise you could at first tbh) and they stood far back from the rest of the squad and kept behind cover…think they might have fired once in the whole firefight, totally useless. Linda has her sniper…which A) she ends up pulling out the magnum instead and B) can’t hit for **** or if she does, she fires once then pauses or switches target it seems, they can’t handle a Jackal between them much of the time.
Dont have many complaints myself either other than SWAT spawning in MP
but one campaign issue i hope gets addressed soon is the AI take foreverrrrr to come and get you up, they always take the long way around, wont ever get you up if youre on top of a crate or something or they just stand there and do nothing while youre calling for help
Yeah SWAT spawning locations is actually something that needs a look as well.