Whenever I played Fallout, i like running around, and whenever I shot someone, I liked how, a leg would end up 20 feet away from the body, or you could place the head somewhere you thought was funny. I mean, I liked how Oblivion showed blood on your sword and everything, but was kinda hoping that you could cut someones arm off, or if you beat someone with a blunt object, their head would pop. I know they were developed differently from each other, and I'm not saying we should bring any amount of Fallout into TES, that would ruin it. But I just liked games with a very high gore content.
EDIT:
I thought about it, and with seeing how good the engine is, with the quality of the graphics, I'd like to see a Fallout like theme for dismemberment, but maybe a bit more realistic as well. I think it's a tad bit harder to cut someone through the bone than how it was on Fallout.