LogFAQs > #922001272

From stuff I've read:

Tier 1: Fata Morgana, Higurashi, Ever17, Utawarerumono: Mask of Truth

Tier 2: Muv-Luv Alternative, Little Busters, 999, Virtue's Last Reward, Danganronpa

Tier 3: Danganronpa 2, Zero Time Dilemma, Chaos;Child, Fate/Stay Night, Cross Channel, Utawarerumono: Mask of Deception (this tier is still pretty good)

Tier 4: Phoenix Wright, Umineko, Symphonic Rain

Tier Bad: Muv-Luv

I don't really consider the Utawarerumono games VN's, but they're listed on vndb so whatever

Edit: Oh I didn't read the VN's but attempting to judge off the anime adaptations (which is a bit sketchy), you could add the following:

Tier 1: Steins;Gate, Clannad

Tier 2: Kimi ga Nozomu Eien, Utawarerumono

Tier 3: Kanon, White Album 2 ~Introductory Chapter~

Tier 4: Amagami

Tier Bad: Air
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Oh woops. Putting Advokaiser in my sig like this until I think of something more clever