So far?
He was decent, until Oda took away he one thing that set him apart from everyone else...
Being the unbeatable monster, not only in theory like a lot of villains have been portrayed to be when Luffy faced them, but literally.
Call it dull or whatever, but at least it was unique and apparently the reason why Kaido is suicidal and suffers from mood swings. Which are nice little details and added more depth to his character.
Now since Oden cut him, heck almost ended his life in one hot, all the suspense, intimidation and the question of how and why that "thing" as Big Mom called him, are gone or at least not really apparent, unless current Kaido is not the same as when he fought Oden, which I hope is going to be the case.
after Big Mom. But not really on par with Big Mom yet

You must be the type of guy who likes to have pineapple on his pizza

.