The reason why people don't pick up on Card's shit writing while reading Enders Game is because in Enders Game he substitutes "actually writing complex characters that develop as the story progresses" with "child characters who merely become less foolish as the story progresses". It is a surprisingly common cop-out, making a character a child is a great way to disguise the fact that they only grow in one dimension.
I didn't even think Eder's Game was great or anything. Just an ok SF story. Now, reading your argument, it makes sense. Back in my mind I was probably thinking "What's so great about these little kids learning some shit and growing a couple of years?"
