It's all well and good, but it could deserve to be changed at spots. There were way too many original enemies, with the only classic enemies coming from the Mario series. Smash 4's Adventure Mode should focus more on the classic enemies and bosses, but still have a story like the Subspace Emissary.
Heck yes. The story was very interesting and I like how each of the character's story mixes in. But I think some changes should be made though, like more enemies from other series and maybe some more creative names for levels.