The update that's supposed to fix bot AI hasn't shown up on PS3 or XBox yet, only PC, and from what I've heard, hasn't actually made a difference.
And ENEMY bots get more aggressive and difficult to fight as you level up, but FRIENDLY bots stay stupid the whole way through, only getting new abilities.
It's kind of a shame, honestly. But it's not as bad on hard, in my experience. Some missions are still more of a challenge than they should be, and the enemy aim is hacker-grade, so if they can get a good line on you from long-range, you're screwed. Even that's more fair than having your teammates go "Hmmm... finish the hack we're at 99% on, or run off to capture a Command Post? Well, there's only 3 enemy Engineers in sight, they're not going to be a problem if we leave" *runs off to capture the CP, leaving the enemies to kill off the player they left behind and wipe the entire hack before you have a chance to respawn, let alone get back to try and defend it*
Even when they are not capturing CP's they are just standing there not completing the objective even when no enemies are in sight. They also can't defend a person for [censored]. I can't do the mission where you have to hack the missile to prevent Resistance from destroying the Founder tower because when I go to hack the crane I end up killing the enemies so that my team can pass because they are too dumb to keep themselves alive and when I am finally repairing the crane, my team gets overrun in a split-second. If(by the help of God) I finally finish the repair on the crane, I switch to operative and the same process happens again. Only THIS time, when my team gets overrun by the Resistance and I die, the damn engineers remove my hack box within mere seconds.
I honestly don't care that they don't complete objectives, but at least make them competent enough to guard my ass since I do. Also I really wish heavies couldn't gun me down from 1000 feet away with a [censored] Gotlung gun, while I can't even hit them from 20 feet away with an SMG