My boys have the Castle, pirates and Star Wars Brickmaster books and all three are pretty good. The Castle and Pirates models are limited, but the pieces are useful regardless. Surprisingly the Star Wars one has some excellent little models in it. So my guess is that this will be decent for the price.
The Ninjago theme itself? Well my boys have a few of the spinners and they are...okay. I like the ninjas versus skeletons theme, however the vehicles the skeletons ride...I see the skeleton ridin'...I be hatin'.
"He is a very shallow critic who cannot see an eternal rebel in the heart of a conservative." - G.K. Chesterton