that's at least 40 hours of single player content you just described right there.
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You have Classic Modes, which you run once
It has WoL, which you run once
It has Multi-Man Melee, which you run once
It has home-run contest, which you run when you feel like it
And Spirit Battles
And that's it.
If you factor in online as a single-player content, since it's 1v1, then sure, it effectively has infinite content, but for PVE content? It's incredibly lacking.