I'm midway through seres 3 and I think it's good. Nowhere near as good as the hype built it up to be, but good. Alfie Solomons is the best character in the show by miles. The soundtrack and the style of the show are brilliant, but there's bits of it I cannot get behind.
The end of series 1 when Campbell proposes to Grace nearly had me turning the whole thing off. Over the course of the series you could see he cared for her, but it seemed to be more along the lines of fatherly, protective care rather than marrying her. Didn't buy it for a second and it was so jarringly put there to manufacture a love rivalry between Tommy & him, which imo didn't need to be put there.
I'm not saying it's a bad show, it's just in the pile of alright shows that I've binge watched.