This has been bothering me for a huge time. If you look at My Anime List, you can see that the current ratings of Attack on Titan seasons have decreased. All of Attack on Titan seasons had ratings over 8.50, but now the all seasons are getting ratings lower than 8.50 what do you think? are the newcomers of the series find it that normal of a series?
MAL is known for having loads of bot/spam accounts that exist solely to rate popular shows a score of 1/10. They can mess with the overall rating, and filtering them takes time to average the real score once more. They mostly targeted the Gintama anime's entries, but now it's possible they're prioritizing series with upcoming sequels. That... or it's just haters.