Just to put my two cents into this little discussion.
First off, props to Caffiend for posting these reviews! They were well written!
I've played AA2, and I have to say that the biggest draw for me is just customizing the girls. I have to agree with Nautica that there was too much RPG and not enough pure interaction...too hard to get the girl to the point of actually wanting to be with you, and too much risk of losing it after that. Just my personal preference

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I love RPG games, such as skyrim, etc....but AA2's core gameplay felt more like a grindfest...

I've never played Girlvania, nor it's predecessor, so I can't comment on that.
I do like 3Dsexvilla, to a point...again, the customiztion is amazing...though the voices of the girls and the horribly cheesy dialog gets to me

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