Honestly, while it has stayed true to the original story so far and the upgraded Underground along with the new park to catch legendaries is nice, the art style is ruining it. I loved the old ones and was so excited when I heard these were coming out, I even pre-ordered the double pack. Even after seeing what it would like in the trailers I stuck out my pre-order and hoped it would be better; but it wasn't. I regret getting both, one would've been enough, if even that.
It gives a little nostalgic feeling and seeing it in newer graphics is nice, but again, the whole chibi thing just does not work for me. It's only getting 3 out of 5 stars simply because it's Pokemon Diamond and Pearl.
Overall, I'm pretty underwhelmed and wouldn't bother buying until it's much cheaper, if at all.