Speaking of Smash Run, I never realized how underwhelming it was regarding bosses and mini-bosses. Some claimed to have seen Kraid, and remember that "big Kremling mini-boss" that made us go bonkers? All that was as real as the Rosy AT in Brawl in the end, which was really saddening.
Man, I really miss the boss battles from Brawl... Porky, Rayquaza, Petey, heck even Duon, Galleom and all those weirdos. A lot could have been done with Smash Run, or at least, a expanded version on the Wii U called "Smash World" a la Subspace Emissary with more levels and bosses instead of Smash Tour. Ohhh don't get me started on Smash Tour! (*cough*smashparty10*cough*...).
I mean, bosses are a cool way to include relevant and important characters that can't be playable in Smash, not stage hazards but Brawl-styled bosses though.