VN that i just outright dropped is Koisuru Natsu no Last Resort. After the first like 20 minutes, it was a torture for me. There's non existent plot, no character development (literaly all of them were unbearably stupid and boring). When i was like halfway in Umi's route, i just couldn't believe wtf am i even reading (talking about the really sad and disheartening incident about cleaning)
I did not even finish one route. Music was repetitive, after like 10 minutes it got annoying. The only thing this VN had going was the artwork. I like Pulltop's art in VNs, but that's about it.
Except of that, i never decided to read Shizune's route in Katawa Shoujo (i tried, but that student council stuff was kinda boring).
And there's one VN that i stalled, and that is Kara no Shoujo, simply because i got frustrated and angry about the choice and route system. Also, i'm not sure, but i think i was spoiled about the ending anyway, so it will probably be still a long time until i get back to it.