Mashing isn't necessarily anything that is exclusive to Mila players... that applies to nearly every other player for every other fighting game. You should know this.
This should be the point where you learn how to beat the said character when you practice. You may also have to actually play the character to advance yourself further in understanding the strengths and weaknesses of the them. Most (good) Mila players will not be able to "mash" in high level situations anyhow. In fact, player needs to already understand the game system to even play Mila correctly.
Offline, Mila's one of the last characters I'd probably bitch about, except for one move, 6T. Fuck 6T lol. As for bitching, Christie & Hayate are probably near the top of my list.