I love it when it works. I love that, just for a moment, I'm getting a glimpse into the life of someone I didn't know until this book/story started. I love that if it is working, you aren't actually getting to play God, because those pesky wee characters take on their own form of free will. I love the pedanticism of creating a new world and making sure all of the bits of it work, and then forcing the characters to work around it, just like we have to.
I love it when my son tells his friends I'm a writer and they all think he's cool because of it.
I even love it when I hate it.