I've only watched the beginning of the first episode (got bored because, bleh, wedding, then missed the deadline to watch the end) and the second episode so far. I love the settings and the era. Some of the shots are stunning, with surrealist views of Birmingham, an industrial dystopia that wouldn't look out of place in the City of Lost Children. The soundtrack is great, too.
But... I haven't been given reason to fall in love with the main characters yet. It may be because I haven't seen the first two seasons. I don't care for Tommy, I don't have much to say about his wife, and I can't stand Johnny.
There are some characters I like: Ada because she's fun; Aunt Polly, who rocked that dress in Ep. 2; and Arthur. He won me over when he said "Well, I'll have some fooking tea" or something like that.
I'll give it another chance because I can tell it's really good; I know it is. I just hope I'll end up liking Tommy enough to keep watching!