I see what you're saying but the thing with Katie seems to be despite her being attractive, she's one of those people/characters that is very insecure, about many thing's. I've met people like this before and outwardly they seem uber-confident but get some alone time and have a heart to heart with them and they can paint a very different picture. I think Katie is a lot like that, and she uses that snark and sometimes vicious tongue as her shield to not let people into her world until she can build some trust. (Which is what you will do if you're on her path) 
Now Jenna i'll agree with you on that for the most part. The deeply personal spying is a big no no for me but other than that Jenna is a bit more out there than i first thought when i played this game for the first time. Her route gets good ....