Bullstuff, Nick.
PSN isn't a rip off of Second Life at all. I don't know what the forget you think PSN is, but you're thinking of Home. PSN is Playstation Network.
The reason they chose to use bluray discs is so they didn't have to use more than 1 disc for a game. I'm sure HD has this, but in the long run, the Playstation 3 has more value than the 360 now. There are plenty of games out for the Playstation 3, not all of them are great, I will admit. Plenty are also bad for the 360.
Remember: More can mean both good and bad, not just one.