Well that's quite a list for the "most egregious misrepresentation", isn't it?
Still, I can't exactly tell where you're coming from with those two:
Cain's characterization of Mockingbird throughout her one-shot and her ongoing was pretty consistent for Bobbi; Cain's actually a huge Mockingbird fan and referenced a lot of her deep continuity that other people didn't. Only thing she really did that people disliked was the Phantom Rider thing, but that's not really a misrepresentation of her character is it? Just an awkward retcon, that I don't think really stuck anyways. You can make a bigger argument for Nick Spencer's Secret Avengers and the Battle Scars crew having mishandled Mockingbird.
As for America Chavez, was she really even a defined character under Joe Casey so as to be misrepresented? Vengeance was decidedly mediocre, and America didn't make much of an impression in that besides her cheesecake costume. Even then, Gillen actually kept a lot of things about her personality consistent; she's not the type to willingly stick herself on a big superteam, she's pretty cocky, and she's hotheaded. Even Ewing's America was right along those same lines. Only misinterpretation so far has been Rivera (which I actually do think is bad enough to include in this thread).