Docker has a lot of potential and I recently really dug into it. Seems like there are still some rough edges though.
For example, when working you end up with a lot of old items or layers hanging around, and its not clear how to remove or collapse them. I've seen posts complaining about this.
Also, on some commands it outputs the the id as the first column, and sometimes the fourth, or other column. This will make script pipelines harder to write.
I've not gotten far enough to worry about logs, but I hear there is an issue with them.
It is very true I may not be using it correctly... or there could have been lots of stuff still to be done for a .12 release?