Funny enough, even though I do have some issues with WoL, I actually like it a lot more than SSE. The map design is gorgeous, and some of the references in here are unreal in how fan service filled they are. The nichest of the niche got featured in this mode, and I love that. Plus, all of the fights are incredibly creative, and minus some of the more sadistic ones, are all pretty fun.
I say WoL is a solid mode, and is a lot better than I thought it'd be. SSE was great, but having played halfway through it this year the nostalgia goggles did come off a bit and I saw some of the flaws there for sure. All in all, I think WoL is a better campaign mode for a game like Smash.
Besides, I played the 8-Ball stages in Octo Expansion and actually liked them; super difficult things just seem to be my thing lately, lol.
EDIT: My device's autocorrect turned "octo" into "October". Why do I post on my tablet, again?