My frank and honest thoughts on various VNs can be found here. Some of them are more informal than others, with each one having a different flavor of serious.
Aoi Sora no Camus
Bishoujo Mangekyou -Tsumi to Batsu no Shoujo-
Inochi no Spare
Kimi to Boku to no Kishi no Hibi -Rakuen no Chevalier-
Sakura Nikagetsu
Yoru Meguru, Bokura no Maigo Kyoushitsu
Konata yori Kanata made
Natsu no Iro no Nostalgia
Sakura no Mori Dreamers
PP -Pianissimo- Ayatsuri Ningyou no Rinbu
Caucasus ~Nanatsuki no Nie~
Amakano
Amakano 2
Koi x Shin Ai Kanojo
Tsuki no Kanata de Aimashou
Parfait ~Chocolat Second Brew~
Sekai de Ichiban Dame na Koi
Aonatsu Line
Kami no Ue no Mahoutsukai
Aiyoku no Eustia
Kara no Shoujo
Kara no Shoujo - The Second Episode
Gin'iro Haruka
White Album 2
Hoshi Ori Yume Mirai