Karen was pretty intolerable, that's a fact. But on the other hand she was the only freaky chick there, so there's that. Freaky puts a whole lot of weight on the scale..
Karen is the spice in the soup. For some it's too hot for others it's too dull.
Or as my Literature teacher told us back than (oh I hated this stuff!), there has to be a conflict in the story, tell me what is it? Ummm... Karen..? Yeah right, for once...
Nah, devs did absolutely fine with Karen, I don't like Karen, but I like that there is this Karen character, and at the end I even like her a teensy little bit...