Yeah that’s his only pop song that got big notoriety, but I feel like it’s a bit of a disservice to him by considering him a 1 hit wonder considering how good of a jazz artist he is.
Talent has NOTHING to do with whether or not a musician was a chartmaker or not. In fact, a lot of highly-regarded musical acts never really hit mainstream success because their sound is too ambitious. A lot of hits over the years are songs that appeal to the broadest base possible--meaning there's really not a lot that's special about it apart from being "catchy." They've interviewed successful pop songwriters and they know the formula behind writing a good pop hook.
He counts, it's not a disservice, especially because McFerrin would be the first to probably tell you he doesn't give a shit about making hits.
David Bowie's most lauded works are the "Berlin Trilogy" and also some of his most un-commercial work, especially "Lodger." I read in an article that he came out with all his weird shit knowing it wouldn't sell well because he wanted to screw over a producer he didn't like, and once his contract with said producer was up, he came out with "Just Dance," which of course was a gigantic hit.
Proof positive that absolutely horrid musicians can hit the big-time: Limp Bizkit. Again, talent is not really a determining factor here.