Because 9 in a roster of about 50 compared to 4 in a roster of 25 is so much better.
In case you can't do ratios, that's about the same ratio with only a slight increase generally speaking this game.
It also doesn't help that all of the Pokémon that have been playable in smash thus far, have no defined sex but Mewtwo (no sex), Pikachu (male; female Pikachu's have a heart-shaped tail), and Jigglypuff (female; the bow gives it away), and that a lot of the 5 of the newcomers (I count the Mii Fighters as 3 newcomers) can be either sex.
So out of the 36 characters we have now (including G&W), we have 12 females (including 4 characters who can be either sex) and 3 characters with undefined sexes (Charizard and Lucario, and I guess Yoshi since we don't know if there can be female Yoshi's, thus we cannot assume Yoshi is male or female; heck, they might be asexual).
BTW of the 21 characters that are "male only" characters, we got:
-A circle that eats things (Pac-Man)
-A cyborg boy who is Caucasian and/or Japanese (Mega Man)
-A lighter weight class Caucasian/Filipino boxer (Little Mac)
-A 4-bit black & white doodle man (Mr. Game & Watch)
-A Caucasian angel (Pit)
-A turtle demon with hair (Bowser)
-A talk, walking, space fox (Fox McCloud)
-A miniature yellow electric rodent (Pikachu).
-A giant ape who wears a tie (Donkey Kong)
-A monkey who wears a shirt and a hat (Diddy Kong)
-A super fast hedgehog who has issues swimming (Sonic)
-A humanoid guy who uses plant beasts to fight his battles and is roughly half the size of a Triple A battery (Olimar)
-A 1 foot tall (roughly) penguin with clothes and a mallet that claims to be the King of this place called "Dreamland" (Dedede)
-A 10 inch pink puffball that steals its' enemies powers and resides in a locale called "Dreamland" (Kirby)
-A plump and short Italian plummer (Mario)
-A skinny and tall Italian plummer (Luigi)
-A full grown Caucasian and/or Japanese blonde(-ish) sword-wielding man who wears a green tunic (Link)
-A half grown Caucasian and/or Japanese blonde(-ish) sword-wielding teenage cartoon kid who wears a green tunic (Toon Link)
-A skinny Japanese male who wields a sword and has blue hair (Marth)
-A buff as heck European male with a gigantic sword and blue hair (Ike)
That's not exactly "muh represuntation" with the general population of males.
It sounds like a bunch of fantasy characters actually. It also doesn't help that most of them aren't even freaking human.