Hakuoki... pretty naive at times, and some of the routes are very similar to each other. There was too much boring, repetitive text and too little romance.
Cafe Enchanté. I tried to start reading it several times, but... I can't really explain it. It just feels like something is off. Also...
I usually try to read every route because sometimes important parts of the story are revealed in the other routes. But there are a few vn that I just couldn't bring myself to finish. And I kind of feel guilty about that...