Mmm, I agree with some of this list, but it is terrible in some places
Rick Wakeman? No, his stuff is a little weird, but incredibly impressive. You can't expect virtuosos to play predictable, approved music.
Primus? No, they are hella crazy, but got some good stuff. See above, and apply to Claypool
Alan Parson's Project? No, some really cool stuff here. Who else has made a decent Poe concept album? No one, that's who.
Yngwie Malmsteen? Lord no, his newer stuff is crappy, but his greatest hits are very good. Maybe not overly-versatile, but man, can he make with the meedlies!
Kansas? Shut up Blender, just shut up.