Act Themes and General Act Atmosphere

One thing that made D2 so great was the unique atmosphere each act had. There was a general theme like oriental, jungle etc to it each with great and atmospheric music.
Act 2 and 3 of POE seem to be the only acts with a general theme behind them (without the great music). The new acts seem a bit more "thrown together". Like in act 9 for example. You walk down a snowy descent, then take a ladder and boom you're in a desert. Pretty weird feel to that.

I think this is the biggest issue that POE has with attracting more new players. Because the thing that makes POE great is the game system... Once this game manages to make new players play it long enough to actually learn the system it could become a mainstream game i think.