A flashy, exhilarating action experience you'll love
+ Environments sterile but highly detailed futuristic vibe
+Character models are all highly detailed especially the Sam's suit
+Weaponry looks and feels awesome
-Pop-in textures on sandbag cover can distract (some don't even notice it, I do)
-Videos could be of a higher quality
***Sound***
+top notch, even changes for slow-motion
+sounds have tactical meaning and can help you avoid dangerous attacks
+weapons sound unique
***Gameplay***
+Diverse robotic enemies with unique characteristics
+Suit mechanics make you feel uber-powerful without being overpowered
+Being able to boost around the battlefield is genius
+Being able to enter slow-mo whenever you want is also genius
+Lots of enemies but the game is always as smooth as butter, no slowdowns
***Multiplayer***
Doesn't exist. Isn't needed.
There isn't much not to like about this game. It is relatively short, but it has replay value since there are points awarded for everything and there are leader-boards for each mission. There are also 6 challenges which WILL give you a challenge when you are done with the campaign.
Bottom line, if you love shooters, you MUST give this game a whirl. Check out the free demos for both campaign and challenge mode on PSN. If you don't think you'll replay it without multiplayer, at least rent it and play it once.