In my opinion, Docker's killer feature is that installing and testing out Docker is dead-easy - the barrier is very low. People will make a lot of mistakes tryi

In my opinion, Docker's killer feature is that installing and testing out Docker is dead-easy - the barrier is very low. People will make a lot of mistakes trying it out, not understanding it completely before they dive in. Hell - looking at most images pushed on the public docker repo makes me cringe and wonder if a lot of the people who get to that point actually understand what the strength of containers like Docker presents them is. But taking the first steps - even if they are wrong - is easy, it's the the first foot in the door. But once you get familiar with Docker - yes the API is a killer feature. Rocket on the other hand doesn't seems to be something someone might try out when he has 10 minutes spare time. Reading the specs and doc, makes me hesitant of trying it, creating an 'image' seems like a ton of work just to try it out. Yes there are some good ideas there, but it would be sad if there weren't.