I finished reading this today. I planned on dropping it about 30% of the way through. A couple days ago I was really inebriated, and Ender's Game was about all I could read in that state, so I ended up finishing it after all.
I don't enjoy reading about a character who never loses. All the grief and trauma Ender goes through seems to only be written for his accomplishments to be even more impressive. The writing is so self-indulgent and gratuitious that I almost feel bad for making fun of it. If I was a bullied little kid, this book would probably mean a lot to me.