@revfitz: it really depends on what you mean by rough draft.
My very firm writing motto is that 'the first draft ALWAYS sucks'. My writing process involves writing everything by hand and then typing it up on the computer. I find that having the blank space on the computer document allows me to freely change entire sentences while still following the overall plot that occurred in the notebook. Sometimes, however, I deviate from the notebook plot and end up in a completely different spot at the end of the chapter. This is fine because I only go one chapter at a time. My personal nightmare would be to have an entire book written in my notebook because I'd be unable to deviate without wasting tons of work. That being said, scenes I delete do often get recycled in different forms later in my writing, so it's not a complete waste. However, I know I'd end up making compromises in order to stick with the rough draft because I wouldn't want to axe 30 chapters of writing.
That being said, everyone has their own writing style. I do 'exploratory writing' and no planning other than extensive idle daydreaming. Editing makes me bored out of my mind because I already know what happens.
I consider my writing process to be extremely irresponsible, but it works because my main project is extremely irresponsible, hahaha. My secondary project, which I write seriously, has me almost paralyzed from wanting it to be perfect.
The other factor to consider is that I publish each chapter as I write it. Once it's out in the ether, I consider the plot "finalized". After that, I limit myself to reworking word flow and correcting plot inconsistencies. Therefore, I have to write cleanly, as you put it.
The only thing I've written without publishing it as I go was my novella Lonely Light, which is only 5 chapters and a prologue. It was a bit of an aberration because I managed to write it directly on the computer and after it was done, I barely made any changes to it. For something that short (I think it was 30k words), I think it's viable to go straight through because there's a lot less room for the story to deviate. It was the 'cleanest' thing I've ever written, though.
So... yeah. I guess what I want to say is that your rough draft has value if it hammers out your plot. Descriptions, dialogue, poetic imagery, all that can be reworked after, but if the plot changes, it nullifies everything you wrote after that point. However, I do find rewriting rather than staring at awkward paragraphs or sentences to be more effective at fixing everything that's not plot. The way I word things then comes out as an organic whole.