The pluses? The cast, including the dozens of extras that add layers of believability to the odd little Irish town.
The story, a cold case about a long ago trio of missing persons, combines with a creaky Pod-cast Scooby Do adventure, and it meanders a lot. This makes the early episodes a bit slow. The action picks up in the later episodes starting with #5. However, the narrative begins to jump around a lot, flashbacks from other characters perspectives, and hops from one character to another too often.
The eventual resolution of the multiple threads is both a bit of a letdown, and a whirlpool of wrong assumptions getting vetted one by one.
The comedy isn't as non-stop as some reviews and the trailer suggests. It's dark and filled with the personal demons of the heroes complicating their efforts. The personal renaissance each person goes through is satisfying, if a little too neatly accomplished. There are some sly funny moments though, filled with irony and a lack of self awareness.
The three protagonists are conflicted individuals, performed very well by a surprising cast. Siobhan Cullen's Dove is an unrepentant b!+@# who has big problems brewing back home in London. Robyn Cara, who has made a career of playing ditzy characters, at first seems to be playing true to form, but her character Emmy reveals more depth and complexity as each episode unspools. Will Forte is an acquired taste, and his character, Gilbert, is a doofus who's made big mistakes that are nipping at his heels. He continually gets in his own way trying to be nice. Fortunately he becomes less of a tool as the season nears its conclusion.
David Wilmot turns in a great performance as Seamus Gallagher, the mysterious townsman with a scary past, who is trying to embrace a "normal" life.
I recommend it, it isn't high art but there are some laughs and good performances..