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.
YMMV: ef - a fairy tale of the two.
Die for Our Ship: There is quite the hate towards Kei for getting in between Hiro and Miyako. Never mind that Kei eventually ends up with Kyousuke anyway.
First Installment Wins: While fans acknowledge that A Tale of Melodies is excellent, A Tale of Memories tends to get better reviews.
Narm: The scene in episode 11 where Renji and Chihiro finish their date by kissing and then having sex in the rooftop of the school loses quite a part of its emotion when you see Chihiro's clothes neatly and primorously folded on the floor, as if they were just ready for morning use. Waaaaay to distract the viewer from all of the dramatic tension there.
The Woobie: Damn near everybody, but Chihiro and Yuu get it the worst.