A lot of folks crack on Coverdale and Hagar for being unoriginal/cheesy …
I think this is usually based on an unfamiliarity with their bodies of work/decades of output. Yes, there were moment/songs/career choices that were not great, but c’mon now …
Montrose were a seminal and highly influential early Hard Rock band. Sammy gets a lot of points for that.
Coverdale replaced Gillan in Deep Purple and knocked it put of the park with the Burn album and his solo career.
They both went on to create/be involved with some of the more incredible Hard Rock music ever. I think certain folks dis them just because it’s fashionable to do so.