Cedega is completely useless. They stole Wine code a couple of years ago and used dirty hacks to get the games going. Wine used a clean approach and today, Wine has better compatibility in almost every aspect because of that.
As a Wine maintainer, I have quite some experience getting games to work. Crysis does runk. However, there's severe graphical corruption, low FPS and a couple of other bugs. In Cedega, there are no reports that it works at all.