So your main complaints seem to be that Ender is a Mary Sue (doesn't really have any bad qualities), and that Ender as a protagonist is specifically set up so that he is blameless for anything he does.

To the first point... well, it's hard to argue that one. In the first book, Ender is, more or less, untouchable. He's the best at everything, respected by adults, beloved by all except for jerky kids who just get their asses kicked in a shower (sidenote: did they include the shower fight in the movie?)

I suppose I'd argue that, despite all that, there's still a progression of Ender's awesomeness (again, I've only read the book). At the beginning, he's a very smart kid. He gradually masters being a Launchy- and then that's rendered irrelevant by being made a soldier. He's a terrible soldier at first, and gradually masters that. Then he has to gradually master being a platoon leader. Then he has to gradually master being a commander. Then he's super depressed and lives by a lake for a while. Then he has to master being controlling an army.

So yeah, he's not automatically awesome at anything- in fact, he tends to fail at first at most things he does.

But I agree that Ender has some Sue-ish qualities, yes.

As for being blameless... well, it's a core question of the book. Hell, it's a core concept of the book. The entire reason the military is recruiting prepubescent supergeniuses is so they could have a general who wouldn't have to grapple with all the pesky questions of morality that come along with responsibility.

You can be annoyed by that, but it's not a cop-out. The entire book has the theme of "If you don't mean to do something, is it your fault?" Hell, the BUGGERS have the same problem! I don't know if it's covered in the movie, but when the Buggers attacked humanity those two times, they had no idea that each human was a living, breathing, entity.

They just assumed we were like them (i.e. queens controlling a hive mind), and that killing a few million humans was no worse than cutting some blades of grass.

And of course there's the question- addressed repeatedly in the book, and there's even a war tribunal in the epilogue- of whether the adults of the school were ultimately responsible for Ender's actions.

So, yeah. I can see the whole "Is Ender blameless?" thing bugging you, but it's definitely not a cop out- it's one of the central themes of the book.

(Also, I haven't read the sequel books, but as I understand it this question is pounded on repeatedly throughout the series)