Call of the Kappa, Arcade, and Cherokee are all really solid. Call of the Crocodile is extremely confusing and complicated. The plot is kind of all over the place. I'm not really sure what to make of Cradle. That was the last one I read. I liked some ideas in it.
In short, yes some of it is good. Mostly Arcade and Cherokee. Cherokee feels the most like a sequel to Arcade because it has the same cast of characters and villain. I recommend those two books the most, overall. Kappa is entertaining, but the main problem with Gardner's books is that they feel like they change to completely different books halfway through. The shift is pretty jarring. Anyway that's how I feel about them.