After playing the Killzone 2 demo about 20 times last night, I've came to the following conclusions:

The gameplay is excellent. I loved the whole "feel" of everything. The weapons, the enviroments, everything was brilliant. The graphics are amazing. They looked great on my 67" Samsung 1080p HDTV :D The voice acting was ok. Not exactly great, but it wasn't horrible. The controls were very easy to learn, and IMO, the "Standard 1" configuration is the best. While in cover, holding down L2, popping up, then using R3 to aim down the sights works really well. The enemy AI is very intelligent. Taking cover, tossing grenades (very accurately), blind-firing, moving to a different piece of cover if you try to flank them. With AI like this, it makes the game more challenging, which IS a good thing! :D

Overall, after playing the demo many times, I'd have to say that this is just as good, if not better than CoD4. It's definitely going to be the best FPS out for the PS3 :D

Now for a brief list of the pros and cons:

Pros - Great AI, graphics and gameplay. Weapons feel powerful, the default control layout is perfect for the game (IMO, of course :P), Amazing physics, mind-blowing audio

Cons - Game freezes momentarily when loading a new checkpoint (hopefully this will be fixed in the final version), voice acting is sub-par, could've been better, and close combat feels awkward.

Overall, the cons really aren't anything serious, and that's a good thing. Some minor flaws but the good in this game definitely overshadows the few bad things. If I could rate KZ2 now just based off of playing the demo, I'd give it a 9.5/10. The demo was really that good. :D

Now just a few more weeks of waiting until we all get our hands on the full version of the game! >.< I can't wait!!!!

- Later 8)