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Diamond and Pearl are my personal favorite games in the entire series, and I believe they are the objectively best games in the franchise (until tomorrow when X & Y are out and take that throne). Here are my favorite parts of Gen IV:
>best region (biggest plus right here)
>most immersion
>hidden stuff that ACTUALLY FELT HIDDEN
>Kricketot line
And yes, I believe Platinum was a step down from D/P. I could write a fucking doctorate thesis on this but you fuckers wouldn't read it, so here are some bullet points:
>story is dumbed down
>Gym leaders no longer have pokemon not of their type
>dialogue is much worse
>Barry sucks a lot more
>turns Sinnoh much, much more linear
>Cyrus, while more fleshed out, becomes unbearable
All in all, I believe that Gen IV is going to become much more popular in Gen VI, mostly because Gen V will become the new bandwagon punching bag. It's already begun; you can see it here already. The newgenner fog is lifting over Gen V, and revealing what a linear shit heap of a gen it really was.