I have heard of people who didn't like the series (based on the first book) .... I don't understand them, but there you have it. 
I'm sorry but I'm afraid I'm going to be one of those people.
I've only read the first book of course, but I just didn't feel engaged by it at all. I confess I was skimming a bit by the time I got to the second half.
I quite liked the main character, the Inspector, but I found the villagers to be either cliched or so over the top eccentric that they just didn't ring true. I wondered if the later books had a different setting then I might like them better but I see they're all set in Three Pines. It doesn't make me eager to read them.
I found I was more interested in the mystery of what was in Jane's house than who killed her and once that was revealed I struggled to get to the end. Had it not been so highly recommended it would probably have been a DNF but I wanted to give it every opportunity to grab me as it apparently has other people, so I persevered.
It's odd, isn't it, that we can agree on some books so completely but then fail to grasp what the other sees in something else.