1. The Titans became irrelevant.
The anime literally starts with humanity fighting terrifying giants… then eventually turns into a geopolitical war with Titans feeling like side weapons.

2. The “genius writing” is sometimes just delayed information.
Keeping information from the audience ≠ automatically being brilliant storytelling.
A mystery isn't automatically peak just because the answer comes 50 episodes later.

3. Eren carried the entire second half.
Take Eren out of the story and suddenly people have to explain why they care about half the political plot.

4. The ending divided the fandom for a reason.
You can call it “misunderstood.”
You can call it “deep.”
But if millions of fans needed an entire courtroom debate to explain what the ending was supposedly trying to say… maybe the execution wasn't as flawless as people claim.

5. The fandom confused complexity with quality.
A story can have symbolism, politics, foreshadowing and

500 IQ plot twists…

…and STILL have bad writing.
Attack on Titan isn't automatically a masterpiece because it made you say:
“WAIT… EVERYTHING WAS CONNECTED?!”
Sometimes a plot twist is just a plot twist.