I sampled it on comment section. Your point of negative comments gaining more traction and being higher up is valid. But honestly, I haven’t heard much positive things about SM at all. With XY[Z], even YouTube comments were filled with positive things (till Ash lost the league and people lost their heads).Youtube is the absolute worst source of sampling opinions, like ever. Possibly even worse than Twitter or Facebook. Social media algorithms aren't built to give you a clear overview of the opinions. They just present you with the stuff that you are most likely to interact with based on everything they know about you. More clicks = more advertisement money. It's as simple as that. If Youtube sees you primarily watch videos hating on the pokémon anime, it's most likely going to suggest more videos like that. It's not going to suggest the videos promoting it, it's statistically unlikely you'd click on those. And the comment section is exactly the same. It puts the comments you're most likely to interact with on top. And usually those are extreme opinions, usually hating, because they gain the most backlash (and therefore interaction).
Ratings on review sites like those are usually very generous. Compared the SM rating to other Pokémon seasons, and then tell me how it compares.Or... the people complaining on the internet are a vocal minority and most people are actually fine with it but feel no need to really talk about it. I just had a look at MyAnimeList, and out of the 10000+ people who have added the series to their list and rated it there, well over 60% gave it a 7/10 or above. Which is of course just one site, but it's a far bigger sampling size than vocally disgruntled commenters on Reddit, YouTube or this forum.