Just got it the other day and I have been playing it a little bit. :) I actually like it. Mostly because I've always loved seeing the pokemon in 3D.
Plus its extra nice to see your shinies fly out of that pokeball.
I know theres not much to it besides 3D battles and online capabilities, but it was enough for me to spend 36$ CAN on it. (bought it factory sealed off ebay!) And I really love the random battle feature, where I can play with an annonymous trainer somewhere on the planet and test my skillz :o!! lol
Overall I'd say its great for a pokemon fan who loves battling, plain and simple. If you're looking for adventure or a storyline and that's it, I suggest you stick to DP. DP is the main game, PBR is one of those "on the side" games, that just makes you further enjoy DP.
I admit though, sitting on my couch or wandering around the living room and battling someone in Japan is pretty interesting.