Let me mention the pros first, so I can get to the extensive list of cons. I will be brief here: The combat is fun as all get out. It was a blast to play through the single player. The game is beautiful, and seems highly optimized for the PC. The game nails the lore (mostly, there's a few hiccups, that as a Noob to the 40k universe I'm still not sure about).
Now the cons: The single player is short. Shorter than Modern Warfare. This wouldn't be a problem if the multiplayer was on the same level as Modern Warfare. It isn't though. All connections are P 2 P
, resulting in massive Lag. MW was P 2 P
as well from what I can gather, but it had highly optimized netcode to reduce lag. Space Marine doesn't, and you'll realize this the first game you play. The multiplayer itself is in bad need of balancing. You don't feel like a Space Marine in multiplayer, you feel like a guardsman forced into the suit with how fast you die in general. There's a few more troublesome areas of the multiplayer which lead me to believe it was a mere afterthought: there very few maps, and only 2 gametypes. There's no push to talk functionality. Someone will be eating his mic in everyone of your games, and it will drive you to chaos.
So to sum it up, single player that's really fun for 6 hours, and multiplayer that's not worth it until they fix a lot of things. For now I can only recommend you rent it for a console, and don't purchase it at full price. Maybe if there's a really good steam sale on it buy it.