Ok if we are talking about musical releases but I was thinking in general. What I value the most is THE IDEA. There were so many albums during 60's, 70's and 80's period made at approximate lengths between 20 and 40 minutes. Check any release from Kraftwerk, Tangerine Dream or Dead Can Dance. They all had great concepts but were that short, and it made sense in those days cause formats were different. Just because our spoiled ears got used to longer formats doesn't mean the artists are scaming anyone if they have an idea presented in no matter what length. For the same reason I respect short films, good example is Bunuel's visual masterpiece Andalusian Dog, that lasts 16 minutes but fuck, was that the picture that broke the standards for the time when it was released.