Decent twist to the storyline between Acts 3 and 4. I'm about halfway through Act 4 myself. The biggest improvement (and detraction) is the auction house. You can snag some sweet gear for your character early on and then sell it at a profit later.
"A government big enough to give you everything you need, is a government big enough to take away everything that you have...." -- Thomas Jefferson
"The U. S. Constitution doesn't guarantee happiness, only the pursuit of it. You have to catch up with it yourself." -- Benjamin Franklin
"I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them." -- Thomas Jefferson