The argument made against Kurzweil could surely be made about anyone who makes claims about the future.
I do find some of Kurzweil's far out predictions kind of fun though, and I have a habit of checking on them every few years to see how he's doing.
Here's a list of some of them:http://en.wikipedia.org/wiki/Predictions_made_by_Ray_Kurzwei...
At least now that he's head of engineering at Google he might have a chance of making his predictions about robot servants and intelligent glasses come true.