Saying XY is one of the worst series is such a stretch
I mean Johto and Unova exist
I like XY, it was a decent series with great moments and disregarding journeys it's my fourth fav series rn, third if we include johto in OS
Unpopularly I do like the first two seasons of XY more than XYZ simply coz while I was high on the hype train for XYZ at the time, it disappointed me a lot with its conclusions for Serena, ash, the Kalos league and greninja. Bonnie was amazing though in xyz, Clermont was fine too and Team flare is one of the best arcs in the entire anime, loved it!
The Kalos league imo is such a misstep, being so rushed, ash's battles not being shown properly and the ending to it, but hey the 6v6 battles were still good, it's a fine league but far from being the best, compared to the rest it's more or less the same, I'd rank it above OS, BW and AG leagues for sure and down Sinnoh, Alola and Johto leagues.
XY can be overrated imo due to its loud fanbase IN MY VIEW (don't attack me for this lol), and ig a lot of the distaste towards the fandom occurs from how much they **** on SM when it was airing and well some people to this day do that although the majority imo have moved on and just celebrate their fav series while appreciating other series too, but you will find a few oddballs who will be like SM is garbage, PJ is garbage, XY is Perfection foreverrrrrr but to be fair, that you will find in any fandom be it SM, PJ, DP, AG, OS (I refuse to believe BW stans actually exist in the sense that BW is perfect lol)
XY is great, I don't hate it at all like some people think even if it feels like I talk more about its negatives then positives. I enjoyed it a lot and I really like Yajima, especially with the top tier movies he's doing (the AU movies revived them imo)