No, I don't think Brawl is over-rated! It's pure fun that is accesible but has a learning curve once you get better.
People whining about only 9 moves per character should shut up because it works just fine! You don't have to train like 3 years to get the hang of it.
Oh; as for an overrated fighting game; Soul Calibur! Great game but how the game scores 9's is beyond me!

THE NETHERLANDS







