That's the result of review bombing by people with agendas.
Plenty of agendas exist on both extremer sides of the gamut. The funny part might be if they're both being trolled by the show.
Take the Captain Marvel movie for example, it had more negative reviews, (like thousands) before the movie had even opened than any other MCU movie had gotten overall the entire time they had been reviewable.
Because CM didn't have the entire Avengers saga to help prop it up beforehand? Without the Avengers saga in existence, would CM have gotten the same figures? No, like me nobody knows. But it's a poor correlation to suggest, that CM did oh-so-well solely because of hate reviews and not because of its place in the franchise.
As for ratings, it's like saying "50 million smokers can't be wrong!" A cliched line but often true nonetheless. But always listen to most opinions across the gamut, regardless if one agrees or not. What they say doesn't always equate to what one believes they say. One always hears what one wants. That's what some of these review sites seem to be about.