Sorry, everyone's entitled to their opinion but this statement is just ridiculous. I don't what what game you're playing but it isn't Crysis 2. Whether or not it's as good-looking as Crysis/Warhead is debatable (it certainly looks a lot 'smoother' if you know what I mean) but it's still one of the best looking games available.
I can't comment on whether the gameplay's worse as I haven't played DNF, but personally I loved every minute of it after the slower first levels. It's a far cry from a 'corridor' shooter and actually affords you a lot of the freedom of the first game in much the same way.
The overstatements on this thread are hilarious.