Not voting until you add Monster Girl Quest and/or Monster Girl Quest: Paradox FFS!!!
I played through the entirety of Part 1 and 2 of Paradox without spanking my monkey, as a true connoisseur I power-farmed all my party members and mastered all jobs.
The art in Monster Girl Quest is great, but as with most visual novels, the gameplay is almost nonexistent. Definitely good for what it is though.
The gameplay starts off quite simple, then most fights with non-mook monsters become almost a puzzle as the games advance and you get extra tools and enemies become more complex. You only get glimpses of this in the last third or so of part 1, but then 2 and 3 get significantly better.
The strong point of MGQ is definitely the characters. It has a massive cast where many major and minor characters, and especially the main character good old Luka-boy (cough) are developed over the games, as long as you focus on the canon events. Otherwise you'll find that even when he becomes a badass fighting for a better world, Luka quickly becomes a bitch-ass shota every time he loses. And well, I don't think I've ever found anyone who didn't find a waifu or three in this game, though I'm not sure if that's due to character personalities or fetishes.
The writing and story aren't bad either. It's a hero's journey that's competently done. Nothing brilliant, but interesting enough and the characters for the most part can be competently humorous, villanous, endearing or sometimes even fucking scary in the case of some unfeeling or sadistic monsters. And there's some seriously fucked up shit in the game too. As in, holy shit someone expecting a happy story about fucking monster girls will find an increasingly apocalyptic world with some unspeakable shit happening to innocent people and/or the protagonist while the world has its own politics and cultures sometimes connected to the local fauna of monsters.
There's also an impressive amount of effort put into some aspects of the game. For example, when you lose a fight you get a sex scene that can vary depending on what move finished off the hero, or what part of the fight he was defeated at, then you get a slide explaining his fate after losing, and then you get a short scene of Goddess Illia mocking Luka and sometimes giving him pointers on how to win the fight, with every monster then getting their own encyclopedia entry with their description/story and the ability to repeat that fight anytime or replay CG scenes. And that's for literally hundred of monsters over the trilogy. That's nuts.
I originally expected little from it but then became easily my favourite eroge up there with Sengoku Rance and it's very easy to get the entire original game (it's designed so you can combine parts 1, 2 and 3 into a single game) fully translated.
(I bet a few .txt files were updated this day)