Yes, I had the same thought with Snape--that in a way, he was even more admirable because he chose to do the morally right thing even though it was hard. He chose the side of good even though everyone hated him, even though he had no friends there and nobody (except Dumbledore) trusted him. He had to do dangerous spying work and then report to people who gave him nothing. That's when I came up with that sentence that James is the sort who finds it easy to be good. James would make a great warrior for good. Snape, on the other hand, finds none of it easy but chose it anyway.

Harry is being herded into the side of good, though I wouldn't exactly say he was born to it. That makes it a little bit harder for him, though he desperately wants to please everyone on the good side. But I wonder if we'll see him having to think about it all in the next couple books. I wonder if we'll see him having to make choices. Not sure.

The twins really are bullies. When I think about it, it's hard to pick out exactly how they're written differently from Slytherin bullies so that you're supposed to like them. I mean, they even pick on their friends and family, so it's not like it's just because they're on the protagonists' side. Though they only do really cruel things to characters we don't know or characters we aren't supposed to like. I think Harry just automatically likes them because they're part of the family that rescues him. If they were even random Gryffindors I'm not so sure he'd approve of them.