Meltzer said it himself, WWE have always overrated Orton. Orton's a good worker, but he's never been the big draw they think he is.
Basically, if Orton were not who he was, he quite frankly would have been fired years ago. No joke.
I don't think it's the Orton name, if that's what you're implying, but rather the fact that he's one of Triple H's pet projects. He's still a fantastic wrestler.