Quoted from jackd104:
I would be excited if Diablo 3 wasn’t so bad. I’ve lost faith in the dark lord.
Sounds like they're taking similar feedback into account and going back to a more customizable skill system for D4.
Went back to D2 at least 6 times. Gave up on D3 some months after it came out and never went back, but the auction house paid for both copies I got and the computer I built for my GF at the time, and then some... for the short while it lasted, I was getting about $100-$300+ per day from the auction house with little effort (buying for game gold and flipping). Was also possible to multiply sale space by selling on the foreign auction houses.
However, I agree with many that the auction house is part of what made D3 terrible.
Hopefully there's no auction house in D4 and trading goes back to something closer to D2. Also hopefully with better control against hacking.