I too think Crysis is much better than Crysis 2. But Crysis 2 seems to have more action than Crysis, and much better gameplay. But the graphics, IMHO, looks way better in Crysis.
The main difference to me between the two is the feel. Crysis1 gives instantaneous movement response from controls - it makes you feel like you're directly connected to the player, and the gunplay mechanics are awesome as well. Crysis 2 by comparison is slow and clunky, with that terrible jump lag....which is one reason I can't stand the multiplayer - compared to Crysis 1 it's like crawling through molasses after getting drunk. I'm so utterly disappointed that they totally abandoned the masterful FPS mechanics they introduced in the first game.
The giant weapon / narrow FOV thing is another thing I don't like. Even after modifying the FOV it still doesn't look "open" like Crysis. I don't know much about the subject, but I understand this is a difference of vertical FOV vs horizontal FOV implementation.