[quote name='King J Gatz']I played the demo and liked it but is the rest of the game fun? Can't find any reviews online. Help pimp in distress!!!!![/QUOTE]
If you liked the demo you should like the whole game... Yes, you kill Orks for about half the game but Relic does a real good job of mixing up the encounters. Aka the tactics you have to use change noticeably from battle to battle... and, really, I was quite impressed with the story. (Now, like any shooter it can be boiled down to “Go to 'A' kill everything between here and there... and then go to B and repeat” but the story has some surprising and great depth. Allot, but not all, of the voice acting is quite good.)
The MP is solid but a bit undercooked. Its very competent, the challenges/unlocks will keep you playing, but there's only two modes... Team Deathmatch and a Territory capture game.
Admittedly, I'm a big 40K fan so I'm a bit bias but I can honestly say... This is the game I've waited 15 years* to play and it does NOT disappoint in any way, shape, or form. (If only DNF could have said that.)
* 15 years is not my age, its my time exposed to the 40K universe. Also, I think its pretty safe to say that the talented people at Relic have dreamed for the chance to make this game... Its obvious that it was a labor of love.
As for the comparisons to War for Cybertron... I think they are pretty fitting as that was another game that people had waited decades to play, myself included, and it didn't disappoint outside of some voice work too. (IMHO)
Honestly, I think Warhammer 40K: Space Marine is runner up only to Batman: Arkham Asylum as this consoles generations best licensed IP game... (and really, all three of them; Space Marine, Arkham, and WfC, rank real damn high on the all time list.)