Reasons DPPt sucked:
1) The 4th Gen Pokemon are the most rush and uncreative
2)The Physical-Special split
3) The story line with Team Galactic and such was too over the top
4)The Gym Leaders and E4 were way too easy
5)The Sinnoh region doesn't have many Water routes
1 is true, a lot of them are pretty terrible. That's not to say there aren't any good ones though. I don't know much about 2, but from what I've heard, it's not awful. Doesn't make a huge difference. The storylines lately have been just too much, there needs to be less apocalyptic themes in there. People trying to control time and all that. The gym leaders weren't too easy, nor the E4. They were easier than usual, but maybe they needed to be toned down a bit. And the water routes? Kanto had two small water routes, Johto had 1 fairly long one, and Hoenn had a bunch because the focus of that story involved the sea. I think Sinnoh had 2, with 1 optional one, which is about average (ignoring Hoenn's spike).