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D/P were obviously rushed. Torturously frustrating wild encounters in a cave you have to go through over and over. Only one fire pokemon in the whole game aside from the starter. Battles going incredibly slow for some reason. The XP bar being light blue on a light grey background and unreadable because of it. Zero explanation given for what the red chain is or what it does or how anyonw knows about it. No named admins/commanders for Team Galactic aside from Cyrus.
The fact that almost all of this was changed in Platinum shows that the games simply needed more time for development and testing. For comparison, look at B/W ad B2/W2. Same hardware, same company, probably the same budget. That's what a DS pokemon COULD have been. They also have flaws but they certainly don't feel undercooked.