Yeah, I don't understand why some people have the "I would cut this character in a hearbeat" or "this character doesn't deserve a spot in Smash because x, y, or z" mindset. To echo what others have said, Smash opened up so many franchises that I'd never known before. I never knew who Ness was when I first saw him in 64, but Earthbound/MOTHER has become one of my all time favourite franchises, and Earthbound is my favourite SNES game.
Looking at Ultimate, I didn't know who Richter was, but seeing how fun and well designed he and Simon are in Ultimate made me want to try out Castlevania for the first time.
This series is a celebration of the characters and franchises that appear within it, and Sakurai does an amazing job of presenting them to new and burgeoning fans. Sure, you don't have to like a character that is included or one that someone wishes for, but thinking a character would be better off not included or would somehow make the final product worth less, than you're being selfish and unnecessarily negative.