FYI smashchu, Project M tends to appeal to casuals moreso than Brawl does, once they've been introduced to both. I personally know a group of about 5 casuals (I play with them during the fall/spring semesters) that refuse to go back to brawl now that I've introduced them to Project M, despite being an unfinished product with less characters. I've heard dozens of testimonials from friends of casuals as well who say they've switched over to Project M because they enjoy it more.
Something else I would like to point out is that I got hardcore into Brawl before I got hardcore into melee. I played melee first of course, when I was younger and it was the newest smash bros at the time. When Brawl came out, I got more interested in the series, and started watching youtube videos to improve my game. But when I stumbled across melee videos from time to time, and tried to do those things in brawl, I was disappointed when they didn't work. Eventually I just dropped Brawl for Melee, and when I found out I could have what I loved from BOTH, I don't think I've played Brawl OR Melee since.
I think Project M appeals more greatly to anyone who goes into it without absolute reservation than any other installment in the series to be quite honest. I know this upsets you as a Brawl hardcorist, but the fact is that the mechanics that made melee great are the best we know to use right now, so we're going to use them, and are going to clamor for their return in SSB4.