I totally agree... I think it's important even if a course only has a few reviews, in fact I might say it's even more important. If a course has none, you know it's a crapshoot and you "go at your own risk" so to speak.
But often, a course's first few reviews (especially for courses off the beaten path) are from locals who are just so happy to have a course close to home, and inflate the ratings because they love it so much they can't really see it objectively, or may not have enough courses played to provide a sound basis for a decent comparative rating. Then you get there and realize their little piece of heaven wasn't worth going out of your way for.
Gotta give apdrvya credit for his quest to review the entire state of Michigan... dude's doing some great work. Every state needs a TR that does this!