Well, I've only played it for a few hours and I am quite shocked by it all.
I have yet to play The Subspace Emissary, but I'll try that once I get back from Windover tomorrow.
As for the Classic Mode, I must admit that it is quite different and harder than Melee's. Especially the battle before Master Hand where you face 3 computers.
I went and had several battles with the computers in the free for all Brawls. Usually, on Level 1, the comps can't get down many of my lives, but they proved to be tougher. They actually got down a good number of lives. Also note that I normally put items on HIGH, and they still can't do much normally. This time, I got to admit that they were good.
So far, I've gotten Luigi and Ness. I'm hoping to get Snake and Sonic soon. After all, I've chosen them as my main choices. Lucario is the final choice I've made for my top 4 choices.
I'll be willing to play on-line by at least Thursday. Here's hoping for the best.

And on a side note, I LOVE the music. It is all beautifully done.
As far as I see it, this is one game I doubt I'll EVER tire of. I'll be having fun with it for many years to come.