Cynic- Underrated. It never got the atention it deserved,they are extremely gifted musicians that are ignored as technical gods in favor or stupid kids that say " Sean who? he cant be better than lars ulrich dude"
Death-(esp. their "Symbolic" album): From the symbolic era and forth, death really took a genre that was in a dead end on america ( death metal ) and did something amazing with it. Most of today's american death metal bands are still gore freaks playing blasting drummer, its cool and i love it dont get me wrong, but after the 200 bands that are pretty much the same with different flavors, you need inovation and people who take huge chances like chuck did.
Judas Priest- Overrated. Ill expand: they were fashionable simplistic boring music with some degree of talent on guitar. I hate the "o man they are really old what did you expected from a band in the 70s", i say bullshit mozart and company have been dead for 100s of years literally, time is not an excuse to do primitive music, and their did nothing but pushing an image to sell, o and they were popular. Its sad but metal started as a trend too.
Enslaved- Mmm, no comment, i never really cared for them too much.
Anthrax- They rule, but they got exesive bad comments when they did those rap stuff, it was not bad at all imho, it was just too threaten for most metalheads out there. What gets me its how biohazard was accepted by most metal people at one point, and those same people talked crap about anthrax.
King Diamond- This guy has the single most annoying singing style i have heart in my life. Its also seriously overrated imho, while the guitar work its sometimes good, mainly when laroque does his thing, the songs are just...boring to me. Not the kind of boring i dislike ( like judas priest ) but having that...thing singing in such an annoying fashion with such a ridiculous annoying image its just a mayor turn off.