The GTN needs a lot of work in general. The "ZOMGZ go back to WoW NUB!" posts are very pointless. People like this game, and are providing constructive criticism to help improve it. The GTN dysfunction might not be a huge issue right now, but it will be in a month or two when more people are high level. No working search interface, general clunkiness, a cap low enough to make bulk selling of goods and raw mats difficult, etc.
I think a lot of people here have never actually played the AH in WoW, based on economic exploitation comments. Me posting up 5 of every useful rare gem cut in stacks of 1 is not screwing the economy. Me posting up 20 stacks of 20 dust, along with 50 stacks of 5 dust is not screwing the economy. Me posting up a few dozen shards is not screwing the economy. Me buying a few hundred stacks of ore to prospect is not screwing the economy, in fact it's getting you your gems for a lot less money, since I can afford to drop 20k at once on a lot of ore and herbs to transmute a few stacks at far lower cost than you'd ever be able to.
Due to simple economies of scale, players like me REDUCE your costs. Someone dealing with a tenth the volume that I do will simply never be able to deliver things at the prices that I do. That is why I consistently SELL hundreds of items a day, because I bring them to market cheaper than other people do. The lousy GTN interface means that I can't do that nearly as effectively as I can in WoW, and that is not good for the health of the economy.