I've been reading detective stories since I was knee high to a grasshopper, starting off with Holmes and Poirot. The Thursday Murder Club is not in the same class, but it does have a dry humour pervading it which those classics do not. Whether people who don't appreciate or understand dry British humour will get that is another matter.
I thought the characters in the book are well drawn, perhaps almost caricatures in some instances. And I thought the plot was... okay, but perhaps there was just too much going on, too many red herrings to discover. Maybe a little less would be more.
But overall, I enjoyed the book and certainly wouldn't try o dissuade anyone from reading it.