>>43285069I can't speak for Platinum, but I'm incredibly nostalgic for Diamond and Pearl. At the time of their release, they were above average and a lot of new and unique features, but that didn't make the game age better, it just made it better at the time.
TPCI also did a great job advertising it at the time, probably the best of a semi-modern game. I remember they tried the same shtick with BW and it didn't work as well though.
HGSS blew them out of the water though, so they didn't even get to live in the lime light incredibly long, and many people ended up caring more about those remakes than DPP anyway.