I feel like I've been seeing much the same pieces from every designer, so I don't see how the fact that Rachel Zoe's pieces aren't screamingly original makes her any worse than most. I don't spend a lot of time looking at high-end clothing though, so perhaps my eye isn't yet discerning enough to tell different designers apart on sight very well. Much of the stuff that the fashion world sighs over doesn't look that great when translated from ethereal 19-year-old goddesses to ordinary women, even those ordinary women who are fit and attractive. Rachel's stuff at least looks like mortals could wear many of the pieces and look good.
At a glance, I like a lot of the pieces in her line (especially the wine-colored jacket and the leather vest), and would wear them if they fit/flattered me, and if I had that kind of money to spend on clothes. The fact that her clothes aren't all that edgy is more of a positive than a negative for me.