I picked this game up a couple days ago and I love it. It's like Full SPectrum Warrior + Call of Duty(PC) = Brothers in Arms. I played through the first 5 levels or so on the Campaign and it's great, The AI is somewhat smart (They aint genius but they do put up a good fight, keep in mind that I am playing on Normal difficulty too, rest assured it is much better on Authentic), and your allies are great at providing cover fire and watching your back.
The game starts out a little slow but once you hit level 3 you feel like you are there, and by that time you will be able to fully utilize your squads tactics.
The online is fast and fun, by far the best UbiSoft online adventure to date, but the game could have been so much more with online Co-op, but it's only a couple weeks until Chaos Theory and Lockdown come out anyway. Online is only 2 vs 2 Fireteam Squads which can be great fun with a good host, but I can't help but wonder what the game would have been like with 16 or even 12 players.
All in all the game is fantastic, GOOD JOB GEARBOX SOFTWARE ( The team behind the PC port of Halo was actually the developer of this game)!
I give it a 9/10