Most stand up comedy is like that as well: a presentation rather than a production. My own comedy show, Granny's Gone Wild changes every day as I add and subtract jokes from the text. Jay Foreman sings his songs at the Underbelly in the same format. He stands before his audience and amuses them, talks to them and charms them as only Jay Foreman can do. Both these shows are excellent and should not be missed but they are casual in every sense. They are not slick, well timed, fast paced plays. They are experiences.
In contrast, The Door at the Cowbarn at 12:30 and The S&M show that finished on the 15th were productions with scenery, a director and controlled, careful lighting. It is that extra touch that makes these two shows so memorable. And that is why I find Fringe shows so delightful. I am given a variety of presentations, many different formats and I can decide for myself which one has entertained me and which has moved me or given me something memorable to think about. Each of these shows had value in its own way but the ones who more casual are not likely to make the "big time" until they have invested in some kind of professional production techniques.