I think it's wrong to think that lectures are always inferior. There have been many cases where a professor trying for a more interactive class has made the experience worse for me.
This most often comes in the form of prolonged rhetorical questions. A teacher, fearing he is losing the class' interest might pause to ask "And, what is the benefit of the scientific method?" The point here is clearly to gauge whether the class understands and is following along in the train of thought. Usually, the rhetorical question has multiple interpretations and valid answers. And usually, the students are not so much wrong, as they simply fail to track what answer the teacher is hoping for. For example, the students might answer the rhetorical question above with "It helps us understand the world.", "It allows us to test theories.", etc. In fact, the teacher was looking for something like "It allows for the independent checking and confirmation of the findings of others."
In a real world example, this sidebar of questions might have taken minutes, and more often than not, completely breaks my train of thought. Often, the teach has completely paused a valid train of thought to either measure or enhance class participation, and in doing so has made it harder for me to understand the lesson.
Sometimes this goes even more poorly, and the teach just wants to witness a "class discussion," which can often entail spending much of the class polling the students for their thoughts. Depending on the subject, this can be a total waste of time. Most of the students in the class are poorly informed, and their thoughts are much less useful than a traditional lecture would have been.
I certainly admit that interactive methods of teaching can be particularly effective, but they are not an unalloyed good. They can often be worse than a simple lecture.