One thing people have to understand is that even if someone had a 35mm movie camera they could shoot some pretty crappy footage if they do not know what they were doing. Traditional filmmaking is not a point and shoot game for idiots. The essential rules of filmmaking are basically the same no matter what guage you are using.The problem is that Super 8mm cameras are cheap enough that any point and shoot idiot can get their hands on one.
Another thing that I hear is people always pointing out is choice of camera in comparing quality differences in Super 8mm. While great lenses and state of maintainence are certainly factors here and it is fair to say that there are some real bottom of the barrel cameras that leave a lot to be desired, there are plenty of testimonies and examples of great Super 8mm footage being shot with no-name cameras. Many super 8 cameras that originated from ghost manufacturers and sold under different names actually sourced their optics from big names like Pentax. Unfortunately they don't have the "Name prestige" like Canon or Nikon so many people shy away from them out of snobery. Equally as unfortunate, these no-name cameras are therefore cheap enough for the "point and shoot idiots" that don't know what they are doing to get their hands on and who are more than capable enough to screw up whatever they shoot.