Not talking about the multiplayer issues here... hell theirs so many of those I don't even play MP much, waiting for the patch for that...

But I do have three huge beefs with this game, in reference to playing the campaign in SP, meaning with AI.

1. Stupid teammate AI: Sometimes they can be good, sometimes great... the move command, flank commands, fire commands, suppress commands all work well... but my number one beef with the AI is that you will send them on a flank or behind some cover like a wall or rock formation, and they move to the area but do not use any of the provided cover, instead they just stand out in the opening and engage enemies till they drop one by one.

2. Round drop: Sure it is cool and correct that a round will drop over distance, (but as a ex-sniper for the US Army, (not the infantry sniper school, but the military police SWAT sniper school), I know all about rounds, drop, windage, etc etc... In the military most regular infantry rifles are zeroed in at 200 yards, civilian police rifles are zeroed in at 100 yards... so the sights should be dead on with most weapons up to 200 yards... only after 200 yards do you have to adjust the sight for drop and windage.
In game anything over what seems to be 50 yards or so you have to manually adjust for drop... this causes a single shot kill to take about 5 rounds as you try and adjust the solution.. ridiculous and NOT real.

3. Timed missions: Now I can understand have time sensitive missions, like at the beginning when we had a certain about of time to take down radar and some AA missiles, etc etc... thats realistic/real world... but to put time missions into a compound assault, or an actual battle is ridiculous. I'm current stuck on mission 7, played it for 5 days strait, "load last checkpoint" at least 10 times a day, trying to get through this mission...
The mission to take out perimeter guard units, then move in and take out guards on the other side... after 30 to 45 minutes each time, I get to one of the last enemy targets before mission complete... and get the message, "took to long, mission aborted", reload, repeat... their is no reason why a mission likes this needs to be done in the amount of time they give, sure re-enforcements can arrive, but not in that short of time, and we have units on the outside perimeter waiting to come in.
It's like they put ridiculous time restraints on missions that didn't need them, just to get you to play it a little less tactical and more run and gun in.

Rant over, lol... 2 and 3 can probably be fixed via a patch (but won't), but 1 can't be fixed via a patch, that requires new/more programming.

IMO