After looking at the full data, it's clear that people tried to manipulate it.
217 users (27.13%) have fewer than 10 posts, and
142 have 0.
70 users (8.75%) registered in January 2017.
The Witcher 3 had 265 5/5 votes, but 87 of them (32.83%) came from users with <10 posts.
Age of Decadence had 245 5/5 votes, but 57 came from that group. And no, these users didn't downvote AoD. Quite the opposite, actually: only 3 out of 217 gave it a 2/5 and 11 gave it a 3/5.
Tyranny had 45 5/5 votes, but 22 came from that group.
Divinity: Original Sin had 5/5 votes, with 69 from that group.
The top 10 results wouldn't have been too different with some form of vetting, but the rest changes a lot. Here's what the top 30 would look like with a minimum of 10 posts and registered since December 2015:
- The Witcher 3 - 3,80
- Age of Decadence - 3,79
- Underrail - 3,78 (+1)
- Divinity: Original Sin - 3,77 (-1)
- Shadowrun: Dragonfall - 3,73 (+1)
- Dark Souls - 3,69 (-1)
- NEO Scavenger - 3,45 (+1)
- Dragon's Dogma - 3,42 (-1)
- FTL - 3,40 (+1)
- Legend of Grimrock II - 3,39 (-1)
- Fallout 1.5: Resurrection - 3,36
- Shadowrun: Hong Kong - 3,35 (+1)
- Dark Souls II - 3,31 (+3)
- Dark Souls III - 3,299 (-2)
- Dungeon Rats - 3,298 (+2)
- Heroine's Quest - 3,29 (+3)
- Invisible, Inc. - 3,282 (+5)
- Expeditions: Conquistador - 3,276 (-3)
- Xenonauts - 3,274 (-1)
- Valkyria Chronicles - 3,267 (-6)
- Blackguards - 3,263 (+7)
- Tales of Maj'Eyal - 3,260 (-1)
- Might and Magic X: Legacy - 3,24 (+6)
- Legend of Grimrock - 3,233 (-4)
- Stardew Valley - 3,266 (+2)
- Shadowrun: Returns - 3,22
- Lords of Xulima - 3,21 (-2)
- Wasteland 2 - 3,19 (-4)
- Grim Dawn - 3,18 (+1)
- Pillars of Eternity - 3,17 (-7)
Biggest swings compared to the original top 30:
Blackguards (+7)
Pillars of Eternity (-7)
Valkyria Chronicles (-6)
Might and Magic X: Legacy (+6)
Interesting how PoE is the game which benefits the most from inactive/new user votes.