Loved the first series of Whitechapel and was looking forward to this one. I'm still enjoying the characters and location but wish the producers hadn't painted themselves into a corner by duplicating the copycat theme in this second series.
I do find the stuff about the Krays interesting, though, as I don't know much about them. The old photos and film from the 50s/60s are interesting and evocatively used.
Pity that the plot has become so fantasical, really, with the arrival of the Kray twins mark II. As others have mentioned, though, I really enjoyed the comic aspects of the show, especially the donkey!
I wish there was scope for another series but I'd prefer to see it go forward with just a general storyline rather than this copycat mullarkey.