The problem is its all opinion. Ask me what I think the top 50 worst artists are? I'll tell you they all come from either the rap, country, or 'pop' sections of music. Does that mean I'm right? Or does it mean I dislike that music and therefore dislike the individual bands.
For example, I like Toad the Wet Sprocket, they have them as #48, and they list Manowar is being 'gay', not that they arent entitled to their opinions but they mention (keep in mind there is, and I'm quoting "none more metal, none more gay") Judas Priest (I certainly hope someone else gets that).
The Doors and the Goo Goo Dolls are half decent, maybe not great bands, but part of the 50 worst? I'm sorry, I can find 50 bands that have done waaaaay worse and churned out much worse music than them, musical tastes aside.
Anyways, theres a lot of issues with it, keep in mind, this list was probably compiled by the guy who wrote it walking around going "Hey, whats you least favorite band" to 50 people.
On a side note a few of the bands/people that DID deserve to be on there:
Celine Dion
Kenny G
Mike Bolton
Vanilla Ice
Yanni
And they didnt deserve 1st (only because a few of the 'songs' they did were funny as hell) but they deffinetly needed to be on there, ICP