Having just finished reading "Friendship is Optimal" literally less than 10 minutes ago, I didn't find it dark or creepy at all. There are certain aspects of it that are suboptimal (being ponies, not wireheading), but other than that, it sounds like a great world.
There are certain aspects of it that are suboptimal (being ponies, not wireheading)
Can you elaborate? Do you mean that not being able to wirehead is suboptimal?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.