Masterpiece. That's all.

This game nails it in every department. Visuals, music, gameplay, multiplayer, replayability... More of everything: characters, maps, tunes, mechanics, modes. While keeping it's competitive side, this was the one Smash Bros title that really cared about single players with so many things to play around with. It will always keep you busy and having fun with it. We even finally get a proper long lengthed adventure mode with the legendary Subspace Emmisary campaign, that plays like an excellent 2D beat'em up/platformer.

It's clear Nintendo put a lot of care and a large budget in this game, and it shows. It's one of the most polished Nintendo games ever.