Devy: Psychotic Waltz's inspiration is visible in a big part of the best IMHO album of NVRMR: PoE. These killer PoE riffs are just too close to the first Psychotic albums. I understand that you don't like them, I only note it mainly for my own sake, as I am a huge PW fan (after Iofthestorm though).
As for the worst bands:
Well not really having thought about it,
the word "Doors" comes at first in my mind.
Soundgarden as well.
Nirvana also.
And my dear Tee noticed Ektomorph.
One more note for my own sake:
I adore Nevermore; I have seen them many times, I have all their albums, in various forms, have many t-shirts (including a sweat shirt of the '95 tour

); I think the guys are cool, as i had the honor to talk a bit with them...
BUT I am an old fashioned metalhead and propably not-so-wide-horizoned one. I do NOT like seven strings. I think that when Jeff uses that fucking 7th string it is too close to some industrialized metal. I think that some of the old feelling got lost when Jeff added that 7th string.
There you have it. I have kept it inside me for a long time and i have felt the need to express it here.
NP: Attack / The secret place / Mortal Energy