I'd brought this up before, IMO opinion reviewers should be limited to the number of 5 star ratings they give, perhaps 1 per 20 or 25 reviews. I've seen too many people who've reviewed 4 courses and given 3 5-star reviews. That's just not even remotely possible to happen.
I really have to disagree with this. What would happen if I went on a roadtrip over the summer played 20 courses and among them were Flip City, Idlewild and some other courses along the way. Under your idea I would not be allowed to rate them both (Flip City & Idlewild) 5s if I wanted to. I know that rating inflation is a problem, but I dont think limiting the # of 5 star ratings a person is allowed to give will solve any problem. And Its pretty easy to know what to do with a review by a person who rated 4 courses and gave 3 - 5 star ratings, just take it with a grain of salt.
Personally I think education is the best way to help control rating inflation. Once people are better aware of the rating system on this website they will be able to better rate courses they play, unless of course they are blatantly blinded by HBB in which case their review will reflect it. Also the more courses a person plays the better idea they will have on what to rate them.