I like Bry's question.
"IS 7 THE TRUE SOURCE OF VOYAGER'S SUCCESS?"
For me Seven really ruined the series. The character concept was interesting, but too much emphasis was placed on her, at the expense of the other characters (save Janeway and the Doctor, but they became more sidekicks to Seven).
As a gay man, Seven as sex appeal was never going to work for me, but I can appreciate an attractive woman. Jeri Ryan is good-looking, with a very curvy figure, but when you have someone like that parade around in catsuits it kinda cheapens the character and continues stereotypes of "sexy sci-fi chick".
Trek should have done something a little better, rather than just giving into fanwank