AH is much easier to navigate/sort and faster to purchase/check price than MW. Price history feature, no running, no loadings between zones, easier SELL LIST management. Only good thing about MW is gear display on retainer but honestly - it will be much better if items will start to actually work different instead of just look different.

Oh, and you're sooooooo wrong saying MW is an anti-RMT tool.
RMTs hardly speculate with prices. They usually focus on intense farming/gathering/NM camping and flood the market with stuff. Their activity usually lowers the prices. MW makes it harder for them at the same level it makes buying/selling harder for all players. It isn't more anti-RMT than it is anti-players. And seriously, SE should focus on making FFXIV playable instead of fighting RMTs. RMTs don't care much about FFXIV atm.
BTW: I prefer dealing with RMTs over dealing with SEs anti-RMT tools. Anti-RMT tools usually harm regular payers with collateral damage. The one and only good manner to deal with RMTs is to ban them.