Probably not a scam, but definitely too good to be true.
There are a lot of places like this on eBay - they are made and shipped from overseas often using very cheap fabric and poor sewing skills. So you most likely won't get something that is top notch - if you don't care about that or can fix it yourself when it arrives, then maybe it is a great deal?
There is also the chance that you might get a well sewn item too...it's just taking a chance, and if you want to purchase these items from a place like this.
As far as the clothes - I saw some different sizes for certain items, M/L...So maybe it depends on what you're looking at.
I saw a news video about this not too long ago - people were saying the pics look great, and they're buying this stuff off of eBay expecting a genuine quality knockoff of the real thing (clothes, shoes, wedding dresses, etc.) and what the people are receiving are not what they expected.
I'm not sure the page you posted sells knockoffs necessarily, but the setup looks very similar to the sites on eBay and such...I'm sure some people would be happy with it, and some wouldn't - probably where the conflicting reviews come from
I read mixed reviews from www.chinawholesalereview.com/store/sammydress. But negative reviews are more than positive. It's better to do more research on them. To online buying from overseas, it is not easy to return and get refund.