I had a great experience, and took the risk of going with it, without reading up on the company. I'm glad I did now, because if I had read all these bad reviews I might not have made the purchases I made.
I ordered a dress and three tops, which were all accurately sized, and looked just like on the site. The fabric quality was very nice for all items, even the all cotton dress I ordered, which could have been "flimsy" - but wasn't. The colors were just as they appeared online, as well.
I also took the trouble to look up the brands online and see if there were any special sizing issues on the actual company's site, rather than just on Zulily. It is a reseller, after all. My order arrived when expected, like it says on the site, it could take a couple weeks. One item came right away, and the others took the expected two weeks.
I would definitely order from them again.