Its strange but the first time I completed the mission it was on hard with the bots. Its mainly the hacking part and sometimes both (repairing the crane)
I'm on PC and I'm using a sandybridge set up which I believe really allows the code to open up as regards bot intelligence.
(Its probably just raw brute power and allocation of threads to the AI routines)
I feel that the AI routines are really some of the best I've seen and its highly probable that the XBox and PS3 are not really capable of
allocating enough of their respective processor clocks to the AI. Which is probably why many people complain about the so called stupidity
of the AI.
I'm currently trying it on easy and alternating with normal just to try and complete the campaign.
Actually the bots on the 360 aren't as stupid as people think. Most people complaining about this were low level characters. I've noticed (as many others have noticed) that the bots will actually get more difficult as you level up. The same people complaining about bot stupidity were later complaining that the bots are ridiculously hard and are almost too difficult. I've noticed that as I near level 20, the bots and objectives are much harder to complete. I blazed through the campaign on my first go around, but now I'm struggling more and more with the missions (I'm level 18 now). Especially near the choke points, I'm having a difficult time when it is only bots. I've even had 4 human players on my team and we couldn't even beat out the CPU on some of the objectives.
Maybe your rank is affecting the difficulty of the bots as many others have noticed.
As for the hacking mission on early launch...my strategy is that I plant the hackbox and then run into that side room while it hacks. If I notice the percentage dropping, I pull around the corner and fire my under barrel grenade launcher at the missile and knock down anyone who tries to disable the hackbox, If the coast is clear, I'll run out, start the hack again and then run and hide in the side room.
This can take longer because the wireless connection on your handheld to the hackbox isn't as strong if you're in that room, but it is better than being exposed and victim of grenade spamming.
Not sure if that helps or maybe you've tried that already. That's just what I do, as I've beaten this level a few times now.