Anything that involves Fallout is great in my book <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />. But seriouslly, I don't care much about Oblivions big world, since the contence within the world is so stale and empty. I'd rather have loads of different levels well developed than a big detailed world done poorlly. You have to fill that big detailed world too <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />.
A thing I was to mention was that I thought Rivellon was unrealisticlly small. I mean, it took five minutes to walk from one end to the other, and that's the entire world! I think Arcanum handles this great by introduceing a worldmap whith locations, where the non-locations (ie, the wilderness) is just... plain trees for example. All doesn't have to be detailed, you can make some continuing wilderness randomly (with the occational small, detailed place like a cave, or a forgotten temple) while blowing the fuse on the "main" locations, such as Verdistis or the Elven forest.