...and it's perfectly useful for small things.
...and not really useful for serious web applications.
As the article points out, there's no real web framework for go, so the majority of things (web apps that is) written in it are toys (see http://go-lang.cat-v.org/go-code).
Most pointedly, there's no compelling structured database story, just a mess. The no-sql solutions like mgo are as good as it gets really. ActiveRecord / SqlAlchemy / NHibernate runs rings around anything that currently exists, and without it, your traditional web apps are pretty difficult to build. You'll find a lot of commentary along those lines from people who've tried.
(...but it turns out a lot of people want tiny little web servers that don't do very much, and serve json. It's great for that~)