The second review (the bad one)

Here is the bad review:
The most intriguing thing about Ender's Game is trying to figure out why it receives raves. The backbone of the plot can be explained in a sentence and while it might have supported a short story (the resolution of the story is predictable half way through) it's too flimsy a frame for a novel. The no-gray-zone series of leadership-lesson episodes read like Card wrote a story to the table of contents in a US Army basic training manual. My only explanation for the book's popularity is that it hit a sweet spot of readers with their hands on the joystick, hungry for a rationalization fantasy for the hours and quarters that they squander in video game parlors mastering Missile Command. Sure, it wasn't one of the worst all-time SCIFI novels, though at least one of Card's other books could be a tossed into that bin. I did read it through to the end. But it certainly doesn't merit topping the amazon.com SCIFI recommendations list with gushing endorsements. Better Sci-Fi? Red/Green/Blue Mars. Stapleton's Sirius. Dune - no question. Clarke's 2001. Diamond Age. Sure. But Ender's Game? Bleh.
-from Amazon