I actualy enjoyed the demo when I had it, but one thing that fucked me off was the completely braindead AI.
Trying to sneak into a compound, I'd be sniping away like a champion, taking out guards unsuspecting.
Then suddenly one of my AI teammates would pop up and go frigging rambo, alerting the kick arse guards, who'd raid the building and wipe me out as they dance around in circles on the roof like a Riverdance recital.
...
Or trying to avoid the guards, sneak away into the bushes, and one of the AI dickheads decides to stand up. Bastard may as well have waved and said hi.
Hope that's been patched as I found it enjoyable otherwise.