I’m gonna re-post this in here, because it looks like a much more sensible crowd 
In my experience the AI is fantastic at defence and mediocre at best on attack (this is after the first patch on PS3). That’s why I chose the resistance for my first hard attempt as they are predominantly defence missions (which seems odd as I would have thought the resistance would attack establishment targets and security would defend - but that’s a discussion for another thread).
As people have said, the AI gets too distracted by sub-objectives and doesn’t seem to put the appropriate emphasis on the primary. This is especially annoying on hack and data carry missions because it is so easy for the enemy to undo all your work. I don’t have a problem with the AI’s willingness to do the objective or let me do it. I have equal success/frustration whether I am the correct class for the objective or not.
I think the problem is that the AI is trying to be too clever by adapting to secondary objectives and sub-goals.
In my opinion, the solution to this problem is for the AI to behave the same whether on attack or defence - follow the simple baheviour of swarming the objective at the top of the wheel with a healthy balance of classes and camping it (i.e. turrets/mines).
Leave the secondary objectives up to the players to go for, be they opening shortcuts or taking command posts or whatever. This might also serve to make defence missions a challenge as well, because as it stands there is a huge disparity between attack and defence missions. Defence is easy to the point that I won a hard mission the other night by letting my 3 year old daughter unload the LMG into a wall in spawn for the entire match, while attack missions are sometimes only passable 1/5, 1/10 or 1/20 times.
Other than that - loving it. Hoping the PS3 commnuity picks up… Looking forward to DLC too 