"Excellent Novel"
Card suggests that this book can be read independently from, "Ender's Game." I disagree. Read Ender's Game, then Ender's Shadow, then re-read Ender's Game. Ender's Shadow follows the same time line and events as Ender's Game, but from the perspective of the character, Bean. These two novels compliment each other so well, that they leave you wanting more. These are two of the best sci-fi novels out there.
"Great Novel"
This is one of the best sci-fi novels out there. Read Ender's Shadow after finishing Ender's Game.