"Calling him a Deepak Chopra is just stupid"

That's not much of an argument. He plays on the standard things that all religions play on: the promise of some form of immortality, which instinctively plays on the fear of death; claims that the near future will be radically different than the present; etc. His extrapolations of exponential growth are not entirely unfounded but he applies the same logic to everything that suits his fancy without taking into account that science and technology have made large but halting steps forward throughout history, and the fundamentals of scientific insight and discovery haven't changed. He talks and sounds like an evangelical to me. No doubt he is a brilliant scientist but that doesn't warrant the cult of personality that has grown up around him, which I perceive as a dangerous thing contrary to the aims of science.

I agree that cults of personality are bad things. But dismissing someone as an evangelist and overrated isn't much of an argument either. It trivializes his very real and important accomplishments, and conveniently allows you to dismiss all of his ideas without looking at them on their individual merits. In short, ad hominem, and unwarranted.

Kurzweil has several functioning products that would have fallen into the mess you dismiss as nonsense two decades ago. Is he wrong on a lot of things? Yes. But so is any other engineer looking for things that haven't been done before. Even if Kurzweil has a spell where he does nothing of any merit for a decade (which has yet to happen) I'll still confidently say you're foolish to rule him out as a crank. He's earned his right to dream aloud.