I am a pretty big fan of certain subgenres of metal.
But I don't like them specifically because they are metal bands, but because they appeal to the attributes that I love in the music I listen to.
Those attributes I love in music are (no particular order): very high levels of musicianship, complexity, deep and broad range of emotional and/or content conveyed, (usually) long form song structure, no need to have "catchy" melodies, no need for verse>chorus>bridge song structure.
For me, the above attributes supersede any specific genre. Once the above attributes are met, I am almost genre "agnostic".
The metal bands I like have most or all of the above attributes.
Progressive metal - Haken, Pain of Salvation, Riverside, Wolverine, Opeth, Caligula's Horse, Lemur Voice, Suncaged, and others.
Technical metal - Cynic, Spastic Ink, Tesseract, The Contortionist, Zero Hour, Anomaly, Atheist, Spiral Architect, Counter-World Experience, Meshuggah, Animals as Leaders, and others.