There are many ways to deal with noise without giving up the performance a raptor gives you. However, I find that they are not noise inside a proper case.
However, there is an article here to give you an idea of what they do for games:http://www.storagereview.com/article...500ADFD_5.html
From there you can decide if the cost and supposed "noise" are worth what they give to you. Do remember that hardrives are the slowest point in the performance of a pc. Swapping, loading large levels and more are all things that rely on that hardrive to deliver. There are VASTLY more people who have used raptors and will never touch another drive than those that have used them and left them. WD names this drive as one of the single largest successes in its history.
If still in doubt, and that's ok, give one a try from a reputable vendor with a reasonable return policy. I'm fairly confident once you've tried one you'll be very happy.