I'm not a huge fan of having to unlock 66 characters, but at least it means that the single player content will feel more meaningful than Smash 4. I can't remember how many characters were unlockable in Smash for Wii U, but I'm pretty sure it was less than ten, so once all of them were unlocked, trips through Classic and All-Star modes felt like a slog.
At least here, there's going to be something pushing me forward, even if it means that I'll have to wait a while to play as Snake, Ridley, K. Rool, Bayonetta, etc.