The first series was good. It meandered at times, but it also had some genuinely brilliant moments in it. Season 2 is very much the same, except it meanders much less, and the genuinely brilliant moments come thick and fast.
There are so many different horror stories and genres covered, all entwined to produce a compelling second series. Even genres you think have been exhausted over the years pack a big punch, such as the serial killer central thread, and there is an excellent exorcism sequence.