Some of the fastest guitarists have not been the best at creating beautiful melodies. It is one thing to be fast, and quite another to create beautiful music, which often involves much more than sheer speed.
One of the legends of guitar, Eric Clapton, refers to himself as "Slow Hand". Other guitar masters such as Carlos Santana and Jeff Beck understand how to pause for feeling, and are gifted at accents and understatement.
Judging and rating guitarists really is subjective. For example my favorite guitarist, because of his inventiveness and expressiveness, is Jimi Hendrix, however Jimi was unorthodox in every way. He played left-handed, and strung his guitar upside down.
I am such a fanatic that I own the same guitar that he often played:
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