It is a great game, with only very minor issues. Here is a detailed review of my experience with it so far.
9/10
Pros:
Great graphics and lighting, good art
compelling story IMO (at least in relation to many other FPS games, keep in mind too, that I am interested in this type of thing, nano-biotech stuff, and alien invasion)
Highly immersive
Fun gameplay
good/smooth animations
Cons:
Slight frame rate issues
a few Texture Pop ins
some AI bugs
a couple animation glitches
The Pros far out weigh all of the cons this game produces. As far as texture pop in, it is only noticeable if you have a trained eye for it, or you are looking for it. Otherwise there is enough going on that you likely wont notice a texture pop. Framerate issues are the same and in no way detracted from my first play through. AI is usually spot on and quite a bit better than most games, but every once in a while an enemy will just be walking into a wall, or something else strange. Doesn't really detract too much, but it happens. I have seen some weird animations like gabbing a guy by the foot, and then suddenly I have him by the neck as it is supposed to be. Or else I saw a guy shift through a wall and then shift right back into my room the middle of a melee fight.
None of these things were huge concerns for me, as they are pretty common in many games with large scale and a lot going on, and they are surprisingly not as common as some reviews were making them out to be. In fact the larger the scale, the more bugs you will see. Just look at fallout 3. Either way, the pro's far outweigh the cons as I have said. The graphics are great, especially the lighting. The story is pretty cool and it is highly immersive, as it is told entirely from first person perspective. Some of the ways the camera moves to look at things and stuff is all pretty highly believable. Now on my second play-through I am really enjoying the story of the nano-suit; which is really what the story is about. I didn't quite understand what all went on with some of the ending parts, but it is mostly coherent, and IMO quite cool (I don't know, I think Nanotech and Biotech are really cool and the Nano-suit is a really cool idea with it's own artificial intelligence.). It is really fun to have the nanosuit at your disposal as you try to stop the alien invasion. The AI is some of the best I have seen. I played through on veteran and had a pretty standard FPS experience in terms of difficulty, but it isn't difficult because some the AI can just spot you and have a lock on, it is difficult because sometime the AI will put you in a sticky situation, or, because you put yourself there. It isn't so much running and gunning as it is tactically determining how you want to accomplish your goal, as you have to maintain energy levels. It isn't a hard game per say (even on the hardest difficulty), you just have to be careful, in which case it can be quite easy. I am playing through again on super soldier and enjoying it even more.
An example of the AI: At one point, I killed two guys fairly discreetly, and generally the guy up on this bridge will spot you and start shooting at you, so I turned and noticed him running instead, I followed him a bit in stealth mode, and found that he ended up calling over and grouping up with another group of soldiers behind some traffic barriers in a fairly defensible position. Not super unique I know, but it is pretty dynamic, because they definitely don't do the same thing every time.
I have only briefly tried the Multiplayer, but it seems pretty good so far and doesn't seem to lag as much even though I have bad internet. When I get some better internet I will really be able to see, but it seems to have better netcode than games like COD BO where I can't even play online because the lag is so frustrating on my bad internet. Needless to say I was pretty surprised it ran as well as it did when I played yesterday. It was all very smooth. There are likely to be some balance issues this early on, but almost any game will have that to start, that is why they patch games these days. And as far as that goes it didn't seem that imbalanced as far as I saw. I can't really give a good review of the Multiplayer so you'll have to read elsewhere. I'll try to remember to update this when I get better internet late spring/early summer.
So all in all, it was a stellar game. If you have a PC that can run it buy it on that. If you have an XBOX 360, I have heard it runs better on that. The PS3 game runs fairly smoothly though so if you do not have any other system, like me, I assure you, you are not missing out. Although, I would be interested to see it running on DX11 on PC. It is supposed to look super good. I am amazed at the realism presented on the PS3, the "worst" of the three versions, so I cannot even imagine how it looks on a high end PC. I would give this game a 9/10 or even a tiny bit higher like a 9.2. The only reasons to take off points are for graphical and AI bugs, glitches, and errors, which are quite seldom, and really didn't detract from the experience I had / that I am having (also, give me a break, what game doesn't have slight graphics and AI bugs?). Another area to take points off is the slightly short campaign. I finished in 8 hrs or so, It could have been close to 9 cause I didn't really look, but still. I would like to see games that are at least 15 hours long, so that is where that comes from. Some people prefer the 7-10 hour thing, and then jumping into the multiplayer, so if that is you, then this is perfect. I realize it is hard for developers to deliver a solid action packed and interesting 15+ hour experience, but I am sick of developers skimping on single player. not that they skimped on this, there are some truly spectacular set pieces and such, but that seems to be the trend these days, shorter and shorter single player games, because multiplayer is where the business is at right now, that is what people want. I am just a bit ticked because Crytek claimed it was a 13 or so hr experience. Maybe I finished it quickly but I really don't think so, it is a 7-10 hr thing I think, which is decent, but I want more. Perhaps there will be some single player DLC down the road, that would be pretty cool.