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The show just doesn't have enough levity, everyone is too serious all the time and all their interactions mostly have to do with the story, so you get episodes where they just talk to each other and plot dump early on. When it's not that, everyone is just kind of...nice to each other, I guess? There's not really anything there between most of the cast, which is an acomplishment since there's so many of them. There's a reason the villain brat girl is well liked, because coomer bait aside, she's actually entertaining and has a bit of bite to her character.
Also the pokemon themselves are largely forgettable because they refused to do anything with any of them minus the starters for most of the run. Let's face it, the only one people really talk about is Meowscarada, even the the piss shilldog is a complete flop.