Beethoven at his time was how we see Metal, punk or Death Metal now (believe it or not).
He was a very rebellious person going against all the classical rules of music, such as structures/forms.
And he was unique in his compositional styles.
Music that is 'rebellious' these days that 'break rules', are typically punk rock, and the variations of rock and metal. That is, music that broke the rules. Metallica when first formed broke many rules that were layed down by Metal bands of the previous generation. (Think Deep Purple, Led Zeppelin or early Iron Maiden, then compare to Metallica). Many rock bands were known for breaking rules, making their own up etc.
Imo, they are comparable but to an extent. Ofcourse, apart from this point, there is no other comparison I can see.