The common criticism is his prediction about the internet:
https://web.archive.org/web/19980610100009/http://www.redher...
> By 2005 or so, it will become clear that the Internet's impact on the economy has been no greater than the fax machine's.
https://web.archive.org/web/19980610100009/http://www.redher...
> By 2005 or so, it will become clear that the Internet's impact on the economy has been no greater than the fax machine's.
Not the latest date at which the Internet was still on par with the fax machine.