I said why, it's funny, most of the characters are engaging and well-rounded, I can care about the characters. The social class differences are striking, I love the interior decour & how they never take their coats off. The landscape is terrific & I like the accents & idioms. The dialogue is excellent, The subplots are good, not predictable. Just the main plot has some aspects I can't tolerate.
I don't watch TV so I may be easily pleased by those kinds of things, btw, but DH who does watch a lot of TV has also enjoyed HV.
You don't have to like everything about a show to still basically enjoy it.
The 1st Inspector Rebus books is terrible for the awful tropes, but the subsequent books & short stories get much better, more interesting, subtle, character-led, funny quirky atmospheric moments instead: HV is like that. It happens a lot in crime drama, the 1st version is formulaic with all the stupid events that never happens in real policing/detective work, and then ... the premise develops. An exception being Call of Duty which actually degenerated from sharp & original into more and more ridiculous.
I can recommend 3 Pines for similar reasons as HV, btw, but only the TV series, not the books. The books may be chocka with tedious tropes.