This could be a cluster fuck of a thread, but before that happens....
What made them who they are..
A willingness to change styles, ambition, iconoclasm, ego, a gift for melody & timing.
Creativity in song writing & experimentation in the studio.
They wrote songs in different keys, used all types of instruments, & they were the culmination of many influences.
They brought excitement, talent, & relative complexity to a new & rapidly changing format.
They were fresh & they were raw.
Two of the greatest songwriters that have ever put pen to paper.
I'm not the biggest fan of them either. But the obvious is the obvious.