So, does Smash Bros have the best roster in a fighting game ever made ?

[Azzanation]

It had the best roster since the N64 game.

I will say Killer Instinct comes a good 2nd place due to its variety of different characters and play styles. Its one of only fighting games I know of that doesn't have any character clones or spin-offs ie Ryu/Ken, Subzero/Scorpion.