I think DGCR is the exception, not the rule. Most ratings systems today are about "your experience" and are practical, as opposed to the "impractical" ratings system here (impractical in that the vast majority of people care about their experience far more than one site's definition of good course design). The system here is about attempting to be objective in rating the design of the course, and to that end the system is more defined. DGCR I would equate to a journal. People are expected to document their reasons, to leave their subjectivity at the door for the rating but then explain it later (for example, nobody should really be lowering a score because a course is too long...they should rate the design and then note in their explanation that the course is very long...while I fully expect people rating their experience to lower the score based on an impression that the course is too long).
DGCR seems more heavy on "justify your rating" while the majority of ratings system use a "your experience is your experience" philosophy where there's no need to justify the rating because the rating reflects how you feel. I think both have their place. Do I really want to play a course where DGCR folks wax philosophic about the amazing course design being used if everyone who played the course actually hated playing there (including DGCR folks who mention in their notes that they hated it?)? Probably not. Do I want to play a course that DGCR says is severely lacking in design if everyone who plays it says it's a blast? Probably.
The key is really knowing the difference in the ratings. If you are someone who wants to go to the movies and watch a technically well-executed movie...DGCR ratings will help tell you that. If you are someone who wants to go to a movie that everyone likes...UDisc and other ratings systems will tell you that.
As an example from a previous post...having a sidewalk nearby is completely irrelevant to whether I want to go play a course. DGCR is going to say "poor design". UDisc is going to give it a terrible rating if you have to wait forever because people are constantly walking on the sidewalk and stopping you from throwing, or a good rating if you never have to wait.
Practically speaking, I check DGCR if I'm planning a "trip" somewhere...even locally. I want to read the journal and justification and take the time to process that information and decide which course I should hit. If I'm in the area and looking for a quick throw, I just wanna know if people like the course or not.