That site has alot of rippoffreports but they also close thousands and thousands of auctions per year.
Most reports are because the buyer did not read the details of the auctions specifically. Most people just read the titel and the small description. They dont read the condition of the item which is the reason that most compliants are made. And they dont calculate shipping costs.
Just because you can buy 1200 pairs of shoes for $2,000 doesnt mean your gonna get them shipped to you for 50 bucks. It could cost up to $2,400 just to ship them to you.
Just read the specifics very closely
There are many liquidation.com buyers here. They will respond to this post with thier advise for a safe transaction. Some have problems but most buy from them regularly with no problems at all.