I got about 6.5 hours of play the first time through, and thought it was great.
I much preferred Clear Sky myself - better graphics, better performance (when you tweak it) and better gameplay. I got 15.5hrs on my first run through Clear Sky and am just about to play through it again, as first time I didn't even join any of the factions - obviously it's more buggy and less streamlined but the core gameplay is very enjoyable. The problem with games like Crysis Warhead is they're too linear and don't have much replayability. Only if they're exceptional does it work, like HL2:Ep2. Warhead is definitely better than the original, though.
I had a play with Crysis Wars too - it was alright, though nothing on TF2. It didn't really seem too balanced, as pretty much every encounter ended up with the person that spots the other one first winning - rarely was there running / hiding or any tactics.
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Founder of the "I Hate Smiley Fitz"
Riley has autism. He has trouble communicating, and in an overstimulating
environment, he can get frightened and run away, leaving his parents frantic. - Auburn
"The price of freedom is eternal vigilance."