Ha...! I thought I was the only one! After some tries I got it, though.
There's nothing left in the game for me to unlock anymore (and I have both 3DS and Wii U versions registered so I'm getting Mewtwo as soon as it's possible...)
I'm not 100% sure I like this game better than Melee. It's super fun and the huge number of characters and content is insanely good. It's far better than Melee in that sense, but the actual physics and controls aren't to my liking as much. Personally, I don't feel Final Smashes really fit the game, so if I'm playing online it'd better be For Glory. And if you're like me and you exploit certain characters, you'll get banned. What am I supposed to do now?