Eh, you saw the result of her going against someone that has actual footwork and can actually throw punching combos together and kick to boot.
The problem with women's MMA is it at the point way back when it all (MMA) started- a bunch of different styles to see who the toughest was.
Since then men's MMA has evolved a lot and women's is still in its infancy- give it some time and you will see Rousey is pretty sloppy technically speaking. She was just able to be extremely aggressive and use her strength and judo against some cans and finally met some competition that is anything but.