I have always liked virtuosic music, be it metal, prog, classical, etc. Jazz is very harmonically sophisticated, I love hearing it wedded to rock. The first really electric Return to Forever album, Hymn of the Seventh Galaxy, is spastic and insane, almost metal, but with latin elements as well. The early Mahavishnu Orchestra is also spastic, but with Indian rhythms. The mid-'70s Miles Davis stuff blows my mind - I love the late '60s stuff when Dave Holland was playing electric bass, the version of "Bitches Brew" on the Fillmore album is almost metal (can you tell I like metal?), and especially Agharta & Pangaea, which are deep African space-funk from the distant past/future.
I know this isn't going to convert anybody, I guess I'm a little surprised at the venom with which people are putting down "fusion". Actually, I don't care about labels, there is specific music I like and nobody else has to like it, I could care less about a label, which often gets in the way of music.