Anyone serious about smash can only be happy about this news, and I think there are a lot of vocal smash fans or old fans that are rekindling their love for smash after this fan service.
That should explain the big fuss.
Edit: I agree with Basil. This may not be the best controller ever made, but it's the best controller so far for smash, and people have spent hours playing melee and brawl with that controller, so it's the best for smash. Also, it's the most comfortable controller ever made, it feels just right. Might be missing some functions over the newer controllers but it fits like a glove, as tbone said.