If you want to render HTML, there's a lot of security features that you won't get with micro-frameworks. And even Beego and Revel have a lot to do to catch up with Rails and Django. So for this type of apps, I would stay with Rails or Django for now (depending on your preferences).

If you make REST APIs, then you can use a micro-framework because there will be less boilerplate to get to what you want. Goji and Gin offer great performances compared to Gorilla, Martini and the others.

I see a lot of companies using Rails or Django for their main app and Go for their background processes. I think this approach is a good first step to get better performances and knowledge of Go, keeping the productivity of these frameworks to render HTML apps.