I played about 10 hours of it yesterday. This game gets a big 2 thumbs up ! This is the most fun I've had online in ages. I never played the originals..so I can't compare it to them. There are a few caveats.
1.) It is resource intensive, you re going to need 2 gigs of ram to play flawlessly.
2.) It is not really a game where you can just go online and play with strangers...you really need something of a working squad to enjoy it. It can be hard to find those randomly online. Me and a few friends bought it, so I really don't worry about that.
3.) Alot of people complain of bugs..I only experienced one, after I unlocked a skill and chose it, the game booted me out and I had to reboot. I am using a fully patched sp2 legit install.
4.) If you haven t played any of the older ones, there is a bit of a learning curve (the game presents you with so much info on the hud and the spawning system is initially unintuitive).
Normally I can't stand fps...I am more of a civilization, rome: tw, or rts guy. This game though just got me addicted to fps though.
I highly recommend it if you have a few other friends willing to pick it up.