Yeah this game is awesome. The level design is really imaginative, I love the water tunnel, the stuff going on in the background of the desert highway, everything really. There's loads of detail, the soundtrack is great, and the shooting action is amazing. And all the bosses are amazing as well. My favourite Wii game released to date - can't get enough of it, and can't recommend it highly enough.
My only complaint would be that in stage 5, the points where the level cuts into and out of the miniboss fights make the stage seem a little disjointed. That's a minor gripe though, it's probably my least preferred stage anyway. I'd still give S&P2 a well-earned 10/10.