Lord nailed it,TOO many genres.

I've actually read how the media critics became spoiled by The Beatles and Stones.They were so ecclectic and diverse on each album,and you would get a helping of blues,reggae,gospel,folk,acoustic,art rock,pyschedelia,early metal,be-bop,,,,,Well the critics always have and always will love diversity.

The problem that followed was the people influenced by these bands only liked some of the songs.Thats when all this branching off started.Bands like Sabath focused on metal,Zep,,,blues rock,,critics killed these bands cuz they repeated themselves.It's gotten really sad.

Also a Phil Anselmo note,besides Pantera and Down,he's got his"other" "other" side-side project,"Super Joint Ritual".
Check Out Phil on Lead Guitar,he's good,been hiding those chops for years.