OS - Kanto: Pokemon personalities. The Pokemon here had some very weak personalities, or personalities that only appeared in a couple of episodes. And yes, this includes many of Ash's Pokemon.
OS - Johto: Time-wasting. Who thought it was a good idea to devote 50% of the series to fillers. And not just fillers, but fillers with the same few plots, repeated over and over again? Misty and Brock did almost nothing, despite all the time they had. We barely got any development for the Pokemon. Like four years and barely anything happened.
AG: Team Rocket. The fatigue was starting to set in, and they felt more and more pointless in this saga.
DP: It's a tie between pacing and animation.
-Pacing. Things didn't need to be this slow or drawn out, with so little happening between big events. The Ash/Paul rivalry got pretty dull because they had to keep it lopsided for so long. This show was aggravating to watch week after week, though it's better as a binge.
-Animation. At least SM's style, as bad as it could be sometimes, lent itself well to the feel of the show. But DP was just plain fugly. Characters were constantly off-model, eyes were off, the backgrounds were bad.
-Originally, I was going to say fillers; DP had some horrendously bad fillers. But the final year of the show did a complete 180 and had really good fillers. Good job for fixing that.
(I don't hate DP or anything. It's a pretty good series. But I was rewatching some episodes recently and a lot of things came rushing back.)
BW: Team Spotlight. So they give Ash so many great Pokemon - in terms of unique species, or personalities, or battle styles, whatever. Rotation would be a fantastic way to break up the monotony of these 3+ year seasons, and could potentially cut down on fillers. And then most of them barely get any screentime, despite having three years and a buttload of time to develop them. Why did Palpitoad get cucked out of screentime for so long? Why not use him against Clay, instead of the Pokemon that has a weakness to Ground and no moves to counter it? You focused on Pignite's old trainer, but what about Snivy's? Leavanny evolved through friendship, yet it barely had any scenes with Ash.
XY: Ash was at his worst here. Yeah, he was strong. But he was so incredibly bland, personality-wise. He had mediocre chemistry with just about everyone, and it felt like a blatant self-insert. There were good moments and he was able to act as a catalyst for a few characters' stories, but these characters were basically getting blood from a stone.
SM:
-The humor. In an anime that constantly overuses jokes, this series' humor got stale by the second episode. We got some good nuggets here and there, but SM is the most insufferable series in terms of humor. And they run pretty much every single joke into the ground.
-Dishonorable mention to Lillie's English VA. Her performance was... not great. I only mention this because my oldest niece had a brief obsession where she talked just like Lillie. It was so freaking obnoxious, and I had to listen to it morning, noon and night. But SM was her favorite series and she loved Lillie, so what can you do?
Journeys: I can't use "lack of team screentime" since BW beat it there. And I can't say "underdeveloped/underutilized recurring characters," since every single series does that. Maybe it's the worst at showcasing its generation. I know it's meant to be about all the regions, but Galar, its story (such as it is), its characters and Pokemon are barely involved. I'm not too fussed, since SwSh had some of the worst character designs in the series, for both humans and Pokemon. I'm glad we didn't get a lot of these hideous freaks, stinking up the screen. But what about Nessa, Bede, Kabu and... I guess that it's it for humans. But I wanted to see the Isle of Armor and Crown Tundra get adaptations.
SM: Ash's design. The artstyle of SM in general was good, it's just Ash looks out like a sore thumb, idk why.
I chalk it up to several things:
- Most characters in the show had standard eyes, eyes that were more expressive, or eyes that really suited them. Unless his eyes were going wide or we got a good close-up, Ash's eyes were a radical departure from the last 2 seasons and the next one. They were also very different from the standard Pokemon styles.
- The little thingies on his cheek were were too wide and stretched out. Sometimes, it looked like he had a weird moustache.
- His spikey hair used to actually be spikey, but they were rounded off here. It's weird. And it only applies to him, because the other characters look similar to how they did in the Gen 7 games.
- His clothes were simpler than much of the main cast's, imo. He had a basic look compared to everyone else.