Sure. I've tried to listen to most of the albums on the list, and found quite a few that I enjoyed and some that I purchased.
A) I don't know of any way to even discover every jazz album ever made, nor do I have time to create that list. Help yourself if you want to do that.
B) The albums that you see listed twice are a glitch that happens occasionally while adding votes. It's very annoying. As far as I know, no albums are actually on there twice.
There are 5 Max Roach albums on the list. 1 Ayler and 1 Shepp.