As I see it, Victoria is by far the most complex female character in the game, and therefore the most interesting. It's definitely worth playing every different route available with her because I'm sure the outcomes will be really different.
But no matter which route you choose, in my opinion she's far from a mere corporate sexbot. She uses not only her enhanced sexual appeal but also her outstanding mental abilities. She also has a mind of her own (remember the scene where she sends her paycheck to a mysterious bank account) and, most significantly, her character evolves.
As far as the story goes, the 3 most important characters in the game are MC (pretty obvious), Gloria (likewise, needless to say) and Victoria.