As a resident, I felt that one of my responsibilities to the medical students was to help them perfect their presentation skills. I did not, though, interrupt rounds to correct them. I preferred to mention things between patients or after rounds, generally in private. And they were always encouraged to give us feedback about how we could run things better.
However, the presentation is the primary means of communication about a patient among the entire team at a teaching hospital, and doctors minds are trained to process information in a certain way. Thus a disorganized presentation makes it harder to think through the case, and a streamlined, well organized presentation will help this thought process and also make rounds move alot faster. I think the one-liner is important to communicate to the team where you are going to go with your systems/problem based assessment and plan, and to let us know that you understand what is going on with the patient.
One caveat is that while I had high expectations for our medical students, I always sat them down on the first day and went through what I wanted to hear in a presentation, and what the attendings would probably ask for if not provided (ex. output from all orifaces/ostomies and change in weight on the peds GI service). Usually presentations were tight and well done after 3-4 days on a service.
Just one opinion from the other side...