PrincessLucina said:
Also: I feel particularly annoyed that my manips have an average of 1.5 Stars. They certainly aren't that bad.
I wouldn't take that personally.
A lot of galleries are voted down not because of their content, but because of their lack of content. Galleries that are 3-4 images tend to have exceptionally low ratings regardless of quality.
That, and this user uploaded a ton of small galleries of similar content back-to-back when he could have just uploaded them all at once. I have a strong feeling that many users just voted low on all of these galleries without really looking at the content in order to condemn that posting behavior.
Even besides all that, image edits (manips), captions, and rewrites tend to be frowned upon at exhentai for one reason or another.
Really, there are tons of reasons why the galleries would have low ratings even if the images are good.