I use blackboard in another college where I am teaching. I am more familiar with it as an instructor than as a student, although as a student I liked Epic better. I think the problem is that the TAs haven't had time to learn all of the enhancements and workings of Blackboard. They were hit with the transition to semesters and transition to blackboard at the same time. It is a bit intimating as an instructor when you first have to use it if you weren't given classes to learn it.
I am sure that they will get better at it as they go.
It really depends on the instructors experience and competence with it that makes or breaks it.