I came across a few of the issues mentioned in that article while using docker in the last 4 months but I have to say I will never look back.
What I like the most personally is how easy it is to install and experiment with 3d party tools. You want an elastic search stack? In one command you have a webserver hosting Kibana with Elastic Search and Logstash properly configured on your local. Jenkins, Elastic Search, Redis, Postgres, etc: they all have their dockerfiles and can be installed as one liners. Removing them is equally as easy.
Oh and I don't know why it is written that running a Docker registry is "extremely complex". Just like any Dockerized app it is a one-liner.
This new ease-of-install just by itself is worth of my gratitude to the guys that build it.