Yes, I have used this for feature roadmaps.

I don’t do what you mentioned (ie. look for paid apps with lots of ratings & a low score), I look for any app with at least one 1 star or 2 star reviews and I also look for any problem (doesn’t have to be related to an app) in reddit or any forum.

To be fair, it’s quite a numbers game to dig for useful problems or insights.

A related video about the process is Amy Hoy’s Sales Safari: https://youtu.be/67JVkG4dpj4