Black and White 2 was, IMO, what B&W should have been, and as such it was enjoyable for a time, but got old fairly quickly, a bit like B&W.
It could be called more B&W 1.5 than 2, as it was almost more of the same, with slight improvements.
If you REALLY loved B&W, and it's reasonably priced somewhere, it might be worth picking up.