Took a while to get off the ground due to all the characters it wanted to use. The most useless of all the characters was Dorian Gray. The first season was the best. Unfortunately, it lost steam and gradually puttered out.
Dumping all known horror characters in it seems like a lazy writing and marketing. Why trying to make a Suicide Squad version of Victorian monsters?? The Vanessa Ives character is already strong enough to be a center point, heck, Eva Green practically steals the whole scene everything she came in. Such a waste.
If this had been a little more concise in the later seasons I think it would have been better. At a certain point, it became much too convoluted indicative of wanting to retain Sky subscriptions rather than creative control. Maybe just watch seasons 1-2.