I scraped Capterra awhile back with this intention. What I learned is that every business category (there are hundreds) had at least 3 market leaders with 4 or more stars.

That’s partially due to Capterra being incentive on behalf on the ads they run to have positive reviews up, but it could indicate also that we’ve reached a saturation point where the CRM for X niche has been largely filled.

Most of these would be posted by competitors :)