I've been vocal about my main problem with Gail so far. Two, actually. The first is that she seems to be a completely empty vessel. Like you said in your post, it's a story driven script, so Gail does whatever the script needs to evolve, but she doesn't seem to do so. As the game progresses, Gail keeps being one of the most basic women you could imagine. She's only motivated by her job, her boyfriend, going shopping and reading erotic novels. There's nothing that sets her apart from being a total clichè, besides the fact that she oozes pure sex through every pore of her body and she doesn't have the slightest problem to use it to her advantage. But even then, as someone said in another comment, those acts don't make her change her overall attitude. She keeps acting naive and unaware of her effects on other people when the game needs her to be, dominant when the scene requires it or a total slut for no actual reason.
As so many people have stated before. The beginning is way too rushed, but I totally understand that's nearly impossible to change now. Instead of that, I'd LOVE to see Gail as a more fleshed out character who can evolve and change the way she feels and sees herself as the game progresses. This is a personal request, but if she could also discover something not specifically sexual that she finds exciting and doesn't scream "basic girl"... It would be awesome to see her honestly enjoying something that she didn't expect she'd like. She always seems to be either worried/mad/upset about something in her life (at least so far, I haven't played the whole game yet) or plotting her next move to climb up the corporate ladder.
Other than that, she's still probably top 3 if not the most attractive character in the whole forum, the art is incredible and the story is interesting, although it could be so much more.
Thanks for reaching the fans to make the game even better!
