Finished the game on veteran just then. Took me around 12-13 hours or so. (think most of that was spent dying over and over at the start of the game.
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Overall pretty satisfied with the campaign, in a way it comes off as a poor sequel to crysis, but on it's own merits - it's a pretty awesome big-budget AAA shooter, for one it actually has a good length, the gameplay (while lacking the sandbox feel of the original game) still retains the awesome core gameplay of the original, and last of all, crytek finally managed to make a game where the aliens are more fun to fight than the humans.
Also compared to most big budget "AAA" games I've played recently, i didn't find myself getting tired of the game half-way through, which is a plus!
Biggest problem with the game is it doesn't feel like it will have as much lasting appeal as the original crysis did, especially since even in the more open levels, there seems to be less opportunities to play around with.
When they make Crysis 3 - I'm hoping they go back to the sandbox open-ended design of the original game with it's huge levels while mixing it up with the scripted linear design of crysis 2 with the aliens and better AI for the human enemies, also bring back the agile feel of the original nanosuit with speed mode and the all the additions the nanosuit from crysis 2 bought to the table, that would be the perfect "crysis" game for me, but sadly they are unlikely to go in that direction.