These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Base: Both the VN and the anime seem to get this, the anime more so. Is it a decent installment/series that just couldn't match Steins;Gate, the most underwhelming of the Sci Adv series, or just an average title?
Base Breaker: Yashio Kaitou himself. He's either an underwhelming protagonist who lacks enough any motivation other than playing Kill-Ballad, or a loyal friend does what he can for the Robotics Club.
Complete Monster: Kou Kimijima, who wants to initiate a massive solar flare For Science!, even though that means a majority of humanity will be killed off in the process.
Les Yay: Frau Kojirou calls Junna Daitoku a "seductive bitch" for smelling of a nice perfume, although it could also be a case of Stupid Sexy Flanders (She tells her to GTFO). She also does something like that during a photo session with Junna.
Or Airi, she's smitten by her, when she sees her in 3D.
The Scrappy: It only took Episode 9 for people to start disliking adult Misaki, seeing how callous she is towards Aki.
Tear Jerker: Doc and Jun's reconciliation in Episode 12.
Airi getting deleted in Episode 15.
Kai's ultimately futile attempt to save Mizuka in episode 16.
Tough Act to Follow: While not the only legitimate criticism, being billed as "the sequel to Steins;Gate" definitely put some high expectations on the series