Likewise, I've mainly ridden in the southwest regions of France (although did have a week in the Lot valley near to Cahors about 7 or 8 years ago). This year (early September) looking to spend a week or 2 in/around the Rhone-Alpes region. Can't wait.
Road qualities are variable but generally better than a lot of the roads in the UK, particularly some of the back roads in the Surrey hills. Having said that it seems to me that some French municipal authorities don't spend any of their budgets on road maintenance - some towns/villages have road surfaces that are 'interesting'. Obviously no French equivalent to the Highways Act!
Robin, read your blog. Interesting and some of the areas familiar too.