I tried ocaml last year (I knew some Haskell and Scala already) and it was hell. The language itself was pretty, that's true. But the schism between Ocaml's stdlib and Jane Street's core lib was incredibly frustrating.

I guess when you're working at Jane Street, use only their core lib and you get some proper onboarding, things could work great. However you're programming very much in a niche community then.