Of course you can rage over it, that's really not the point. The point is that he was a kid and expecting the same things of a child--abused and neglected, no less--is kind of ridiculous.

And that's perfectly fine that you don't want to, but you did in reading the books. Harry wasn't all luck, just lots of luck. You say he didn't take initiative, but he did. Consistently he was the one running off to save the school and its inhabitants from danger. Maybe he wasn't the best student, maybe he wasn't ever going to be the most powerful wizard. Maybe he was just a lucky kid who had a bit of bad luck in being marked by Voldemort, but still made the most of his life.