A serious writer is not to be confused with a solemn writer. A serious writer may be a hawk or a buzzard or even a popinjay, but a solemn writer is always a bloody owl.
Wilde was not a great poet nor a consummate prose writer. He was a very astute Irishman who encompassed in epigrams an esthetic credo which others before him scattered in the space of long pages. He was an enfant terrible.