I always wait for the blu with this show, so i haven't seen Season 3 yet. Hope it's a bit more gripping than Season 2 which was pretty slow/ not that gripping.
The first half of season 3 is absolutely brilliant. The second half is a bit patchier but still has some excellent episodes, including one that I think is probably it's best yet. Overall I think it's definitely the strongest of the 3 so far.