1. The system as it is currently prevents harassment for players when they put items up for sale.
2. It doesn't have an arbitrary "Wait 7 days" mechanic to buy the item or fight over the item.
3. Blind Auctions are a waste of time, Why stand around bid fighting with a blank door to be told "bid refused for an hour because someone put up the blind auction well over what the history suggests for that item.
4. History. It was abused constantly by RMT's. They'd buy up all the items for a certain item they could then resell them to themselves over and over until they got the history to look like the item was worth more or less then normal, then profit off it.
5. The Search Feature Works.
6. Marketwards actually take less time to use now then an AH did in XI in my opinion.