In response to the first comment - that's ridiculous. Having 50k-100k to spend on marketing does not make you legitimate, or useful, it makes you a sucker. And viral/engaging apps are not at all necessarily spammy. Useful apps - like any product, ever - do float above the crap-apps over the course of time and set themselves apart; they do this by maintaining a high standard of quality, usefulness, and respect for their users.
What I find to be most important about this is that MySpace promised - like facebook has promised - an even playing field for developers. Facebook has delivered, myspace has not (I'm getting used to hearing that).