The first series is very good (by any measure not just the snarky ‘for an ITV show’) and I came to it late. It’s quite a true representation of a certain part of the UK. The second series got a bit too fraught (I stopped watching after around the 3rd episode) and the third has just started but I’ve neither seen it or seen any reviews.
Olivia Coleman is a really wonderful actress with a broad range (my favourite performance is in Hot Fuzz) and David Tennant also very good. I’d suggest a look at Rev or Taking over the Asylum as obscure Brit tv shows they have shone in respectively.
Fleabag was excellent and I’ll look forward to the second series.