I think growing up in a small grey town in Scotland, always raining, with the childhood trauma he experienced, probably made him want to bury himself in something that was a mixture of a hiding place and a key to escaping. Sure, he doesn't talk much, but he talks more than he did, and he's now warming to his new role in the spotlight and I'm sure will rise to the challenge of celebrity in the same way that he approaches his tennis - as hard work, but a job that has to be done.
Sure, he isn't bright and breezy like Jock O'Vich, but he isn't that person. He's probably far more interesting than that, and there is a real human story there. A very remarkable one too. One that isn't just about tennis. I think he battles with the juxtaposition of being the best at tennis and wanting to be a recluse, and the irony that something as lonely as tennis was his hiding place. As a person I think he's quite damaged - understandably.