Every kind of music is good, except the boring kind.
Give me a laundry-list and I'll set it to music.
Mr. Wagner has beautiful moments but bad quarters of an hour.
Wagner has lovely moments but awful quarters of an hour.
Wagner is a composer who has beautiful moments but awful quarter hours.
One can't judge Wagner's opera Lohengrin after a first hearing, and I certainly don't intend to hear it a second time.