I don't listen to metal exclusively. I listen to anything, as long as it's good. For example, some songs by Credence, Boston, Kansas, Eric Clapton, Elton John, Fleetwood Mac, Imagine Dragons etc. I love music, so if the song has a some decent structure in terms of harmony and melodics, it's generally good.
Metal bands that I absolutely despise, are dogsht bands like Korn, Slipknot and System of a Down - just straight rubbish to my ears.