I read all the Bosch books before the tv series and the problem I had was not the mixing of the books but the changing of events from the books themselves. His wife, for example has a different relationship with him, I think, in the series.
If you’ve not read any of the books, which are superb, the series as a standalone is excellent. I have to say that I have thoroughly enjoyed the tv series also.
Just to add that Titus Welliver is not far off what I imagined Bosch to be like and he did a great job with the part.
And one of the best parts was the jazz. Suited the mood every time.