Well, I have to be honest and say I'm really not enjoying this.
I still haven't got past the early part on the beach. I just keep getting killed and have to play it all through again.
I've played it through so many times now I'm sick of it. So I thought I'd try a cheat just to get through that part (although if the beginning is this hard I expect the rest of the game will be worse) and within Vista I opened the config file for the difficulty I'm playing at, edited it, but I can't save it, it just won't save. Probably Vista's over zealous security.
So, I'm gonna give it one last try tomorrow and if I'm still just getting annoyed with it, it's going to the second hand shop. And the original Crysis as well, I don't think I'll play that again, it was good up to the part where you had to make your way through the Aliens place and after that, imo, it was a bit crap.
I don't think I'm that bad at games, I've finished almost all fps's I've bought and there's been quite a few of them.
But, I'll be quite honest, Crysis and Crysis Warhead have both been disappointments for me.