I haven't seen any of the new series yet unfortunately but I heard the finale was actually pretty good.
I liked most of the new season so far.
With some really good episodes and one episode that was, at least in my opinion, quite daring. But it's Lynch & Frost and they only made the season for TP fans anyway. They clearly didn't care about getting anybody new to watch the show and I like that.
However, in terms of tone it's much more FWWM than season 1 and 2.