Ever since the buff to the bots' accuracy, there's basically only one way to play checkpoint effectively: Rush the fuck out of the objectives. No teamwork, no working as a squad, no tactics other than rush rush rush. Why is that? Because the bots have stupidly good accuracy and will ALWAYS win in medium and long range engagements unless you get incredibly lucky. It's ridiculous just how precise they are. They see so much as a pixel of you sticking out from hundreds of meters away, you're hosed.
The roles are basically irrelevant. You can't setup an overwatch with an LMG because you'll just get sniped the moment you start firing. You can't setup sight lines to snipe from long range because you'll get counter sniped almost instantly. You have to push the objective as fast as possible and never stop moving because for the bots' terminator like accuracy at range, they fall apart in challenge in CQC. They love to form conga lines when pushing into objectives, so you can just leisurely pick them all off as they slowly creep through a doorway. They'll never take a proactive approach to defense and will always just sit in corners waiting for the players to kill them. Get yourself a handful of incendiary grenades / molotovs and you can form an impenetrable defense by setting doorways on fire. The bots will just stand in the fire as it sears the flesh off their bones. Molotov a doorway during a counter attack and watch the charred bodies pile up.
And the damn technicals. Trying to take one of those things out is a fool's errand because you'll most likely get a face full of .50 caliber the moment the gunner detects you. The thing is, it's not even like he's trying to suppress you. He fires one or two rounds to take out a player and immediately stops firing... it's like a bloody automated turret. Your best hope is blowing it up with a rocket shortly after it guns down one of your teammates and hasn't locked onto you yet.
Did I also mention helicopter support is entirely useless because every bot in the vicinity will lock onto it and gun it down in seconds? It doesn't even matter if you try to protect the heli from RPGs because it will be destroyed by small arms fire in literal seconds.
But here's what gets me... all of these are things we've been complaining about since INS:Source. Why has the AI not advanced in the slightest in 4 years??