I for one kind of enjoy this. It isn't the second coming of christ or anything, but I enjoy it. It was disappointing to see all of those promised features just completely missing. Bugs are still very common, performance is awful, but overall the important thing is that I'm having fun unlike a lot of other people. I would only recommend this to someone if I could make sure they knew what they were getting into.
GOG is probably the best place to buy this game since there's no DRM. Despite the bad performance on my computer, I LOVE this game. It has some of the best physics simulation in any video game out there. I also love the gameplay mechanics, like real-time weapon customization, grabbing and throwing enemies, the really well done stealth gameplay, and so much more. I don't think I'll ever get bored of Crysis.