>>53419461I remember that time very well.
Gen3 came out just after the end of the Pokemania when most children who played Pokémon Red and Blue and strongly associated them with their childhood started to consider themselves too old to play those kind of games.
The games weren't worse, the designs weren't worse, it was all about nostalgia.
Virtually everyone started to shit on gen3 except the younger fans who where too young to play gen1 and 2. For those, Gen3 was considered the best while gen 4 was the start of a decline.
Then a lot of the older fans who let go of Pokemon during their teenage years came back to the series, as young adults, with Platinum or gen5, those are the boomers that generally enjoy every new game because they understood that what was so good about the two first gens was the time period in which they played them, not the games themselves.