A review is literally just an evaluation of media. I can glance at it and say it's shit, and that's a review.

Additionally, where do you draw the line? Do I need to 101% complete DK64 just to explain that I feel like it's an overly-bloated fetch quest? I can come to that understanding within an hour. None of these critics need to watch the whole show to tell you if they think it's worth the investment in time. No one is going to recommend something that starts off as two hours of pure garbage.

The problem largely comes down to people (sometimes seemingly intentionally) refusing to engage with reviews in good faith. The author isn't going "This show is absolute garbage from start to finish", she lays out exactly what she saw and what she thought of it. "I watched two episodes. Those episodes were bad. I skipped ahead to see if the show changed much, it didn't". Most 'bad reviews' are entirely reasonable if you actually read them from a neutral standpoint instead of reading the cherrypicked facts about the review that fanboys are screaming their tits off about.