Agreed - and the way they begin to shoehorn cliffhangers into the section before each ad break, the formulaic reveal that the bad guy isn't actually *the* bad guy...
I enjoyed them at the time, in a sort of pottering around doing something else way, but then did have the benefit of having a year between series. I fear that the shortcomings would be all too apparent in a binge watch.
Anyroad, I finished S2 of Line of Duty, and then S3, having watched them in parallel - I can only echo the praise of other posters, and say again that it's worth catching up on the first two if you can.
I've begun S1 of Peaky Blinders (about 30 min into the first episode, and am enjoying that).
Also queued up via iPlayer, I have "The Hollow Crown", "The Fades" and "Hinterland". Whether I can get through that lot remains to be seen, although the bank holiday weather is doing its best to help.