I havent had delivery problems and the damaged chair I bought was quickly refunded as was another item I purchased. The customer service reps were eager to help, offering replacements or refunds.
However, beware of buying furniture that requires assembly. My experience has been that the directions can be unclear, parts are often very heavy, labeled poorly, if at all, and do not always fit easily together.
I think the problem is with the vendors Wayfair uses, all of whom seem to have different quality of product and delivery and customer service policies. But Wayfairs customer service, for me, has been responsive and prompt. Not sure that makes up for the uncertainty of whether or not youre going to get something you really like or the hassle of replacement or refund though.
Still, it really is true that you get what you pay for so if you want to be sure youll like something, go where you can see/touch the item youre buying. And if youre not handy or dont want the hassle, pay for the manufacturer to assemble your product or buy from a more expensive store that has assembly built into the price in the first place!