You should be able to run Crysis2 OK, maybe not at the "Highest" settings available but still good enough to be proud
Those OCZ memory modules should work great. Newegg reviews really don't mean much, a large number of the reviews posted are made by people with no experience or knowledge. You don't even have to buy the product to make a review and you can check any experience level you want.
OCZ is a very reputable company, while no one can guarantee that you won't have a problem, the chances of a problem are slim.