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Platinum is better, but that's only because D/P are generally agreed to be the worst games in the series. Platinum as a Pokemon game it's still lackluster overall since Sinnoh as a region requires a copious amount of HM usage and still suffers from terrible design choices like Defog. Lastly, the 'main draw', the Distortion World, feels like an empty, extended cutscene.
I don't personally like saying HG/SS are in gen 4 because they're leagues better than D/P/Pt. GF must've had a change in staff if they wen't from making the worst games in the series to the remakes that still hold up today.
As for people saying it's good, well, I think it's a mix of the phenomenon that people will hype up the games they think are getting remakes next, as well as the fact that there's a much larger number of underage on /vp/ these days, D/P are or are near 10 years old so these kids started on it and therefore think it's good.
Anyway, just drop Pearl, it's not worth it.