Instability, unintentional theft, filter bugs and inability to search for items by your class aside, I like the initial features in the Black Lion Trading Company. I even like that it has a name other than auction house. How deliciously RP of them. Better still is that you can at least interact with the market place without being there. No more having to ask, "Anyone near AH can do a price check for me??"
Very Decent Start
I scan the Top listings regularly. I ADORE how it saves me the time of searching for the lowest sale price when I'm setting up my auctions. I LOVE that auctions don’t expire which gives you an opportunity to make a profit on low margin items, ala EQ2. Praise be to the gods of Tyria! Another game gets it - finally. I think it's awesome that you can put in buy orders.
For players interested in trading Gems, I think the market trending data is great. Although I wish it were available for all items with a few more statistics similar to EVE Online. The transaction history features seems to take a bit from EVE and EQ2. I like being able to see a history of what I’ve sold or purchased and for how much. All-in-all, the initial feature-set is decent but what I really need is Auctioneer level features!
Auctioneer is a hugely popular auction house add-on for World of Warcraft. It provides historical stats on the auction house items, as well as stores the results of your own activity. Most anyone who is serious about making money selling items in WOW uses this mod.
Needs More for Metagame Enthusiasts
I believe playing the market is going to be a popular metagame but GW2 lacks what many of us are used to having available in other games. WOW, EQ2 and EVE, all have fan sites that provide trade/market data. WOW and EVE also have player developed add-on. Blizzard went even futher by developing a web-based app to allow interacting with the auction house outside the game.
I understand if ANet doesn't want expose the game to add-on development. I'm perfectly fine with that decision. On the flip side however, that means I'm going to look to them to develop these types of features in the game. With GW2 being one of the few AAA MMOs boasting a game-wide auction house, there are opportunities to turn up the volume on trade as a full-time occupation at end game. I’d like to see them step up to the plate and provide us with features to support it. I need an Auctioneer-like application and I wouldn’t thumb my nose at a mobile app either. HINT-HINT!