I think you may be confusing appearance and content. The Beatles never made their look the focus of their music. But metal bands trade on their appearance as part of their art. That's OK per se, but it doesn't makes their music any better. If you are into heavy style and theatrics (fireworks, lighting, etc) as part of your performance, then I have to ask why don't you have confidence in your music?
BTW: I was never was into David Bowie, and Queen did a great soundtrack for Flash Gorden, but otherwise was unnoticed by me. Likewise the other groups you mention. I will wear my dinosaur badge with honor.