I will add just a couple more things to this discussion. Regarding all the comments about Queen. I was a fan from when they released Seven Seas Of Rhye, which I bought. Thought their first four albums were exellent, with some interesting and, at times, funny lyrics and I personally always like Brian May's guitar tone. Thought their fifth and sixth albums were good too, but from their seventh, Jazz, I felt they went downhill rapidly. Apart from those first six albums, the only other album by them that I really like is Innuendo. Got to say though, although Freddie was a good frontman, I would much rather have Plant or Gillan as front men.
Regarding overplayed songs, I too am totally sick of hearing Bohemian Rhapsody, We Are The Champions and We Will Rock You - all songs I liked when I first bought the albums. I think the worst single they ever did was Another One Bites The Dust, yet that seems to be their most popular with some people. What makes me laugh about some Queen fans is when I say I too was a Queen fan and I ask them what albums they have by Queen. Invariably the majority will say 'I've got the greatest hits' (!) Many of these so called fans look at me blankly when I ask them what they think of songs such as The Prophet's Song, Good Company, Ogre Battle, Lily Of The Valley etc. Not real fans methinks....
Regarding guitarists' tones, although I admired Jan Akkerman's playing ability with Focus, I never liked his tone, it was always too thin and weedy and high for my liking.
As for vocalists, I too don't care for Celine, Mariah or Whitney as others have mentioned here already, though the worst of the three has to be Mariah. I will add to that Tina Turner, although I did like some of her earlier stuff, such as Nutbush City Limits and River Deep - Mountain High. Can't stand her later stuff such as the awful Simply The Best. Can't stand Cher's voice either but, worse than any of those I've mentioned, when it comes to female singers, bottom of the pile for me has to be the atrocious Dolly Parton. Every time I hear that high pitched. helium fuelled whine I cringe!
That will do for now but I'm sure I'll think of others later