Yeah I'm a bit of a fan boy, I would say black man or 13 in the USA is great, Market forces is a bit rough, it is an early book and was originally a screenplay I think but still interesting.
I liked the fantasy series but it isn't for everyone, very grimdark, and this place prepared me more than anything for the gratuitous gay sex which turns a lot of folks off, but if you don't mind that then book one is really good, book to is pretty good and book three is pretty good but there the plot seems disjointed and rushed in quite a few places especially at the end. I felt like soomtimes you went from point a to point c and skipped b. If you where ehh on the 2nd and 3rd kovacks books then this would be a toss up if it is for you.
Tldr, read black man if nothing else.