Honestly, I found her "common route" better than her route. She may had behave like a selfless b*tch towards Kanae with her "wish" and all but, that's actually why I liked it. That was a lot better than being indecisive all the time or just giving up her feelings like she was planning to do in the beginning. She was also feeling guilty and in the end apologized to Kanae so I can forgive her.
This is just personal preference but, would have liked for Kanae to show a bit of disdain towards Mizuki before forgiving her but, I guess it would have felt out of character...
The route itself had absolutely no foreshadowing of the drama surrounding it. Simply came out of nowhere which is why it felt out of place for me.
The plot for the route was fine and I was able to relate to Mizuki's feelings of guilt until the author took it too far with the chocolate girl and Mizuki's father.
Another part I didn't like were the timing of her h-scenes. The main driving forces behind them were "jealousy", "guiltiness" and "self-loathing". Normally I would not mind this but, I think is worth mentioning because, to me, it felt they did it for the wrong reasons...
Loli Mizuki not disappearing was a nice twist, where's my 3P?
Mizuki herself was cute during her ichacha moments and everyone's reactions were really funny. Yuuya was more bearable in this route than in Ayane's as well.