aaubballerkc32 - I can tell ya my quick opinion as a PC gamer, though I have not completed the whole campaign yet. I'm stuck somewhere in a middle of it - got bored.
"it's actually playable" - yes. I consider many games playable though, including the Minesweeper.
You ask about all around experience - well, it's below average. Game gives you one patch, and two choices - cloak or armor mode. It doesn't have any depth or strategy, while AI have serve navigation and IQ problems.
It's not about graphics really, even though there's so much focus on the forum on it, but that's Crytek fault alone. Crytek promised mind-blowing graphics, they delivered 4-years old graphics. It's like... imagine you buy PS3, than play brand new breathtaking PS3 game. You wait 3 years and sequel is released - a sequel made for... PS2 and ported to PS3 without any changes. That's kinda how it looks like telling the story in conslole-players language.

Problem is in playability. Crysis 1 was like an open sandbox - you got an objective and a huge map with many points of interest - depending on what you did and where you go the mission changed and you got it more or less difficult. You could do many various things in many locations trying the same mission 3 or 4 times, each one visiting other regions of map and seeing unseen locations. Crysis 2 feels like one of worst missions in C1 where you had to fly in narrow corridors all the time along pre-defined path, and there wasn't much to do there. It was a mission many players never ever tried to replay cause it was so boring, but now - it's how ENTIRE GAME was made, like the worst part of prequel.
Oh, and let's not forget about MP - Crysis had it playable but bit flawed, Crysis Wars (addon to Crysis) got it very good, though there were areas for improvements pointed out by community billions of times during the years. Crysis 2 removes everything that was good in Crysis 1 (vehicles, multidimensional combat, feeling that you fight in a nanosuit, good maps, good gamemodes, and so on) and besides adding very few good ideas (mostly the anti-camping stuff) it throws in amount of bugs unseen for ages in any big MP-oriented title release. Imagine that many people can't play MP at all despite of pre-ordering the limited or Nano edition, or they have serve problems with playing online.
Another problem is storyline and characters - Crysis 1 was criticized for flat storyline and lack of character development, Crysis Warhead fixed it introducing one of best-made characters in computer games - Psycho. Crysis 2 takes the worst parts of Crysis 1, erased everything that was good, and throws it into one basket forgetting about legacy entirely. Ties between Crysis 1 and Crysis 2 are so rich that they could not exist at all in a first place. Characters... well, the Alcatraz is souless puppet, and there isn't really anyone besides him to fill the hole. Also you completely loose the feeling of being a part of something bigger, feels like a single guy went for hunting even despite of best attempts to make game interesting from Crytek.
So to sum it up - no, the PC players ain't pissed because the game lacks "luxuries native to their platform", they are pissed off because Crytek spent 2 years on creating a sequel to the game that's far worse than the original product. Sadly.