I give it a 10.
I have almost read the whole series. I have read...
Ender's Game
Speaker for the Dead
Xenocide
and
Ender's Shadow
Shadow of the Hegemon
Shadow Puppets
I'm still finishing up Book 4 of the Ender's Series, Children of the Mind, I'm about 2/3 through.
After that, I got that other book to read, The Enderverse(?). The book of short stories in the universe. Then I appear to be finished with the whole series for now. Though I'm unsure if OSC will release another book in the Bean Series, from what I remember the ending to the last Bean book really left alot for a sequel. I hope to see more soon.
Ender's game and its sequels are very very different. I found Ender's Game to be more of a young adults book, while Speaker for the dead really starts to really gets serious and aimed towards and older crowd. It took me a while at first, but I got used to the new style of its sequels, and I learned to enjoy it as well.
The Bean Side of the story with the "Shadow books" are written more like Ender's Game throughout the whole series, so if you find yourself enjoying Ender's Game, but disliking Speaker, you would definatly enjoy the Shadow series.
Last I heard, WB is making a movie on the series, so hopefully that'll turn out great.
I enjoyed both the Ender and Bean series. I can't praise it enough.