Can't really see why they don't just put it in again.. They should take the time comparing drop.rate etc. with an active Auction House, so everyone gets happy..
I spent hours of hours in Diablo II trading stuff, and it was often way more funnier than killing baal tons of times.
Imo I don't like how the drop.rate and rng is now, because it makes everything so damn easy.. You can make a T10 capable char in 2 days, and after a week you can conquer Grift 55+ ..
In Diablo II I had to spent weeks(In the beginning) to farm gear just for making a Tal Rasha sorc..
Perhaps it shouldn't be as before xpac, but Blizzard should have enough experiences in making some sort of trading system so everyone can follow, casuals to pros..
That's just my opinion, but hey, I havn't played that much.. Yet.
And to all the haters.. Please leave.. Just because you guys don't like it, doesn't mean everyone else should hate it.. The game miss a couple of things, but overall it's a OK game..