I am 17 years old and play hardcore games like Sm4sh(I'm stealing this, Neo) and Destiny, and other games like it. I
LOVE this game. The controls are wonky at first but once you get the hang of it there's a lot of fun and surprising amount of complexity to it. Also, though I haven't completed it yet, they say the solo campaign is fantastic, and it's pretty good 4 levels in. I think this is one of the best fresh new titles that Nintendo has had in years. It's so great because it does have elements of that HUGELY popular CoD franchise, but it's in a much safer and friendly environment. In CoD you can get cussed out but a 10 year old and it can just ruin the experience, but in this game it's all good, clean(or messy) fun. But paint rollers need a serious nerf, haha.
DefStamina88, I suggest that you try it out yourself, I think you'll like its lighthearted tone and complexity because these are elements that make the SSB games so great, and I know you love those.
This game is actually kinda addicting, I find myself often saying "one more match" and stuff like that and playing longer than intended. Also, yes, there isn't much content because of the rushed release, but that doesn't bother me as long as the DLC remains free of charge and the base game actually works as intended, unlike so many other rushed releases.