>>32193897I felt they were terrible. They have a similar feel to gen 3, with more neat gimmicks, worse new Pokémon, fewer new Pokémon, a rehashed plot, and edgy and excessive legendaries. Not to mention the extreme amount of HM's and the shrill music (which some people are fond of, but I felt that it didn't turn out well.)
The dex is also garbage in Diamond and Pearl, and only slightly less garbage in Platinum. Expect half of the mons available to be Kantomons. Again. Geodude and Zubat and Magikarp. Again. And again.
Also Poképhilia, implied in US release, explicitly states in Japanese release.
I mean, apart from all that, it: 1.) has a good amount of challenge depending on how you play it and what mons you choose and 2.) it's got some charm with the locale. You might like it. If so, cool. But I hate them, personally, and so I wanted to voice my opinion itt.
This is only for Sinnoh, though. HGSS were really quite good.