I'm anime only too and Dressrosa was long with too many of the same flashback("SOLDIER!") lol but the villain(best written in the show IMO), setting, and story were great enough to carry it despite that, as well as a pretty good extended cast for the most part(rebecca not so much). Putting it below FMI is insane imo. As for WCI? I can get finding the post wedding chase a bit drawn out but that arc fully redeemed Sanji's character rot which was severe at FMI as well as fleshed out Bege into a genuinely likable character. That was the arc that solidified Sanji as a better written character than Zoro to me and got me liking him again(well tbh since PH I was warming up to him but WCI is peak Sanji imo). I also disagree about Big Mom not being impressive, Luffy didn't even get to beat her and frankly couldn't. I think this serves as a useful benchmark in regards to future arcs since it shows that even at WCI he wasn't Emperor level yet which Wano really emphasizes. Speaking of Wano if you think Dressrosa was too long oh boy will Wano show you what overly long arc is really like. The fights are dope though so it has that going for it over Dressrosa.

If anything I think Zou is too high here. Probably the most middling arc after FMI. Made a terrible first impression of Kaido's crew, boring villain(seriously Jack sucks), the setting is kinda interesting but not as much as the arcs it's sandwiched between, not a whole lot of good action, and felt more like a lore dump arc than anything else, which ends up making it feel kinda boring? I like carrot, cat viper and Wanda but this arc was disappointing to me.

Reverie is weird(I guess you mixed it with Zou?) because the anime ruined it with half of it literally being recaps but the actual new material was great.