1 of the problems is how an unwritten rule/tradition has been broken. Smash got 2 games represented from its own series, neither of which are crossovers (This is post is kind of written in their perspective). That series stole an extra spot that could have been used for another series. Both Smash games promise to bring in a lot of players and views, but then there's an inconsistency of KI3 being there. It's not very popular, let alone as popular as BB, which was the 4th biggest game at EVO last year. Somehow P4AU ended up being the 2nd anime fighter instead of BBCPE. The former is less popular. KOF 13 isn't there as well, which is a really good game. Sadly, it isn't as popular as other fighting games
Modern day competitive gaming isn't about how good the games are. They're more about how popular they are, competitively. In every series, except Smash and CS (CS1.6 vs CSS was an even split, I think), the latest versions of games are always the tournament standard. EVO does the same thing to its fighters and Melee is an exception again. From what I've read online, very few are complaining about Melee's depth, Roukiske
Smash is also a kind of a separate game from the traditional fighters. They have their own scenes all to themselves. They even have their own tournaments separate from each other. Some are complaining about how they infiltrate the FGC's tournaments