I think the engine in 1.0 was meant more for a single player game and was a bit bloated. When I looked at ARR coming from 1.0, I can tell a difference with the textures. However, that said, 1.0 ran poorly on all but the most high end of systems and am glad that they chose something a bit more scalable. I wish they would add an "HD Texture Pack" kind of like Bethesda did with Skyrim for people with really good graphics cards.