Alright, so far I have reached the level where it is raining. People who have played the game know where I am. I don't want to spoil anything for anyone who has yet to play this absolutely fantastic game.
I wasn't going to write anything yet but I am drunk, so I figure this is the point where I would probably be most honest. 
Graphics
They are fantastic, however sometimes they could look rather underwhelming, like the level where you meet this guy (Won't say his name) and you are in an apartment building. It look pretty bad compared to the rest of what I have seen. I wonder if it is the superb lighting that makes it looks as great as it does.
I am still undecided on whether or not it is the best I have experienced on consoles. Uncharted 2 looked great as did Killzone 3, however the areas in Crysis 2 are soooo much larger, yet the game looks almost as good as Killzone 3, let me explain a little bit.
Killzone 3 is very action heavy and from what I have experienced thus far (Trophies give me the impression that I am about 50% through, this game is pretty long), Crysis 2 isn't. Could however be because I play more of a stealthy style. Some say that Crysis 2 has more going on in the background but so far I just don't see it, so I need to take that into account.
You will walk across streets and rooftops, see puddles of water on the ground that look great but they seem to only be textures because walking through them has no effect, neither does firing bullets. No ripples, not a thing. Some things in this game seem to be a mixed bag.
I honestly think that ranking something as a king of graphics is stupid when comparing the two so I really won't go too far into it, however if you want my opinion on which game I think looks better and which game I prefer overall, I would say Killzone 3. However, both game look superb and your opinion will easily differ based on whether you prefer realistic or fictional. Both games are awesome and Crysis 2 shows that Crytek did an awesome job when it comes to visuals.
By the way, the lighting is phenominal.
Artificial Intelligence
The enemies can be tough, but it is not really because they are smart but rather because they take quite a few bullets to take down. I have had times where I was walking through a building and many enemies just stood still and didn't move, they really did nothing at all, I could just walk up to each one and just melee them without them even firing a single bullet. I also had times where I would fire a bullet and they would run away only to hit a wall and keep on trying to run, just waiting for me to kill them.
The AI in this game has some issues. The last level I played is a good example.
I started on a rootop and had to find a way into a building on the ground level, there were plenty on enemies there and I was sniping them one by one and there was also a helicopter flying around. I would shoot an enemy and then hide. The enemies made almost no attempts to flank me, they would just duck behind cover for a moment and then continue strolling around, as if I never shot down their comrades. I would then take down another, hide, rinse and repeat until I cleared the area.
You can also run up to a group, shoot a few of them, aggro them and then run back, go into cloak and after a few moments they would go on about their business as usual.
If you are looking for top notch AI, Crysis 2 as far as I have experienced, is not the game you are looking for.
Glitches and other noticable issues
While these aren't gamebreakers in my opinion I still feel they warrant a mention.
I have experienced a wide variety of glitches ranging from enemies stuck in walls, enemies stuck knee deep into the ground, floating enemies, enemies who just stand around and do nothing even if you get in their face, enemies running in place, pop in and also if you look down and run sometimes you will see your character's legs not even move while he just floats around. I have also noticed things like blood on the ground that floats and changes position as you move.
The game is clearly unpolished.
Gameplay
To me this is the most important aspect of a game and quite honestly, this is where I feel Crysis shines. The game is fun, there is no way around it. I have been having so much fun with this title that I feel there is no need to go into a big explanation on why or anything else.
To put it simply, the game gives you many options. It allows you to customize weapons, customize you suit, etc... You get to customize and play the game the way you want to play it. You could easily play the game twice or more and the experience would never be exactly the same.
Yes the game has it's glitches and sometimes the graphics can be great or dull, however the fun factor doesn't suffer and to be quite honest the glitches don't happen all the time, nor do they really hurt your experience.
I would write more but right about now I feel like I am ready to pass out. I will post more of my opinion as I advance in the game if anyone is interested.
If anyone is on the fence about the game I would say to get it. The single player mode so far seems to be really long, I can see myself taking at least 10-15 hours minimum to complete based on how I play it. The framerate is not issue at all, I haven't noticed any big frame drops thus far to be completely honest.
All in all, the game has it's moments, whether they be good or bad, but the fun factor is high. Crytek has delivered an FPS title that plays different from any other that I have thus far experienced this generation and give them a big thumbs up.
