I really don't see what the whole big fuss is about, Interiors and Terrains have always been stuffty, but they were good for some maps, I will miss Bedroom but seriously. Shaders and Shadows WILL be better, gets rid of a lot of lag, makes builds better (because made of bricks) and it gives the opportunity to be MORE creative.
forget you if you do not like it, READ ALL of the other posts saying that there will be more features.
Lag is one of the worst parts, you want lag? Go ahead, but being more creative means BETTER builds. So what if your lame loving RPGs go down the drain, terrains were stuffty, and interiors were ugly. Sure if the vehicles can't go around bricks much but they might make the physics better, stop crying and get over it.
It's time to move on...
*EDIT:
Lemme get my reading glasses, I'm gonna be here a while....