To be fair, you really have to roll your own containers for applications, and it's not hard at all, if you already know how the applications are hosted are on a Linux server.

I've found the single-service Docker containers from the Hub are useful for development (MySQL, Redis, etc.), but the "official" language run-time Docker containers that I've looked at are basically demoware. They are built to give you something that runs with the minimum of effort, rather than being efficient or anything else.