First-time poster here. I did some net surfing to read some reviews on ‘bishoujo’ games for quite a while before actually purchasing one. After a while, they structurally reminded me of choose-your-own-adventure books which I used to read when I was little. Insofar as I am concerned, I consider most visual novels closely related to choose-your-own-adventure books more than to anything else, functionally and structurally speaking. Since I am not much into action or shoot-out games, visual novels suit my preference much better.
Two titles that I have played the most consist of:
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Kana Little Sister: I have played this over and over more than any other visual novel so far. Took me a while to get all six possible endings. The ‘Yumi Ending’ (#3) was the last one to achieve, while the ‘Recollections’ (#5) was the first one. After a couple of attempts, I have noticed that taking note on decisions made accelerates story access quite a bit, although being methodical takes away some of the visual novel’s emotional impacts.
I particularly liked the philosophical undertone of this story, which is pretty much about life and death. Although I was not enthusiastic about having Taka getting involved with Yumi (and much of Yumi is built into the storyline and there is not a whole lot one can do about it!), I think this helps to turn him into a ‘human’ as opposed to a ‘heroic’ character. Giving more novel-time to Yuta might have been more interesting.
Right now, I am working on my ‘fan fiction’ based on Kana Little Sister. Still at doodling stage with a bunch of scribbles and notes. Mine involves a different Taka. What if he were to take the role of ‘big brother’ a bit too far? So much so that Kana is, although still loves him, but afraid of him at the same time, in spite of his gentle attitude towards her? 
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Crescendo: This was the first visual novel that I have purchased. (Previously, I have downloaded and played some old titles from the early to mid '90s, but this has been such a long time ago that I no longer remember them that much.)
Kaho … I felt pretty much going through ‘typical high-school sweetheart genre’. Because of the triangular relationship between her, Tomoyori, and Ryo, I felt Ryo would be better off as a good friend rather than as her boyfriend (even though I achieved both of her endings). I kind of felt sorry for her when pursuing other storylines as Ryo would then be ditching the club publication activities.
Kyoko … also pretty much in the realm of ‘typical high-school sweetheart genre’, although I felt sympathetic towards Kyoko as she has to live on her own yet this arrangement is preferable to living with any one of her parents who do not exactly miss her. I found her straightforward and tender manners pretty attractive.
Yuka … at first, I felt uneasy whenever Ryo accidentally witnesses her participating in ‘extracurricular activities’, then felt somewhat frightened seeing her getting abused by others as well as by her own. On one hand, I felt sorry for her, but on the other hand, I was not enthusiastic about Ryo getting too much involved with her. (A misery attracts another misery, so to speak.) As a matter of fact, my very first ending was Yuka’s non-romantic ending. Felt sad, but looks like Ryo is still the best person for Yuka to talk to after all these years as he is the only one who treats her as a normal girl.
Kaori … perhaps this one is the ‘best’ storyline overall. The most exciting part involves sabotaging her arranged meeting. In particular, the willing help from the rest of the female cast made it so memorable. (Kyoko should be nominated for Emmy Award: Improvisation at its finest!) The wackiest part involves the graduation day in which, if not for Ryo graduating, would have flipped the school upside down with Ryo-Kaori student-teacher sex scandal. The tender part involves Ryo’s regular visits to Kaori’s office as well as in other scenes when they get to talk.
Ayame … I shed the most amount of tears with her storyline. On one hand, she is painfully too kind to Ryo, in spite of what he has done to her a while back. (Ayame should have pressed charges against Ryo and see to it that he graduates from juvenile hall instead of high school!
) To make things even sadder, until towards the end of the storyline, she keeps her feelings tightly shut, especially the fear of having to let go of Ryo. It could have been interesting if another ending were created: A third Ayame ending in which Ryo joins his biological mother and leaves Ayame.