I'm the other way around. I didn't really like the MP demo, but the SP demo was quite fun and I'd consider buying this. If I am assured that the AI will be improved. Now that is hidious in the SP demo, I swear they spent more time on AI in the MP demo!
If the AI can:
1) Attempt to take cover
2) Hit a cow's arse with a banjo
then I'll read reviews and consider a purchase. Just today I was staring in amazement as a bad guy and one of my team mates stood, full exposed (well, they had clothes on, but no cover

), not more than 8 feet away from each other. Both had automatic weapons. Neither hit each other for a good 20 seconds. It was like that scene out of Naked Gun! Eventually I gave up in disgust and wasted the bad guy with one bullet. The good guy was lucky to escape my wrath.
Cheers,
Quboid
War isn't about who's right, its about who's left.