The Wikipedia page for The French Resistance has a section entitled "The Myth of the Resistance", which, with two citations, says that "Many sources claim the notion of the French resistance, in whatever form, is mostly a post-war myth", is this a genuine and/or common opinion? I don't have the expertise to verify it myself. (http://en.wikipedia.org/wiki/French_Resistance#The_Myth_of_the_Resistance)
The problem with this section of the article is that it regroup two different things under "The Myth of the Resistance", without really separating one another. Today's common conception of the Resistance during WWII in France is that it only concerned a minority of the population and was later "mythified" as the main french reaction during the occupation, both to cleanse France name and (mostly) to avoid instability and possibly a civil war after the Liberation. This view is not to be confused with the Petainiste one, who reject the idea of Resistance entirely, considering that it's a Gaulliste lie. I don't know anyone who support that thesis today, so the answer to your question is both yes and no I suppose. While Resistance did become "a Myth", it's not the case any more and French people are (for the most part) aware of that.