From what I've seen the AI is absolutely terrible, flanking and letting you kill 4-5 of them before any clock on that their team mates are dying and try to shoot you.
I had massive hopes for this, but I think I'll pass. Just looks too generic, may as well play MW1.
It's a shame battlefield won't do 2143, there is clearly an interest for a futuristic FPS game with mechs, for something a bit different from the churned out "Modern warfare" crap every year. But making a game essentially the same as CoD, adding jetpacks and replacing killstreaks with mechs just isn't what the market needs.
If I get a beta invite I'll certainly give it a bash, but I cannot believe this will be worth buying at all.