To the French the entire issue of Waterloo and Napoleon is still a touchy one. I read earlier this year that the didn't want to have any sort of anniversary at all - no doubt because they lost. I imagine they won't want to be involved in any commemorations of the Battle of Agincourt in October either.
Remember that in 2003 during the State Visit to the UK the name of the Waterloo Chamber at Windsor Castle was changed for the night - out of respect for French sensibilities over their defeat at that battle.
I would bet that with Waterloo there's an additional sense of loss than the typical defeat might have.
For better or for worse, under Napoleon France was able to regain some of what it had lost during the revolution - and I don't mean in terms of royalty or pomp and circumstance, but in terms of prosperity and national pride. France was everyone's enemy the moment the revolution started, but for a time under Napoleon they were able to regain some of the ground they had lost and proved themselves to still be in the game so to speak (successful military campaigns in Spain and Italy certainly helped).
Waterloo ended that. I mean, yes, the decline started well before Waterloo, but Napoleon's defeat at Waterloo is what definitively ended it. Napoleon was exiled, France was forced to accept a monarch again the game changed for them basically.
In the 80 years (or so) following the French Revolution, France went through incredible political chaos. First a monarchy, then a republic, then an empire, then a monarchy followed by a very brief empire ending in Waterloo which was followed by that same monarchy, then a second republic, then another round of monarchy and empire (I can't remember which came first, but the reigns of Louis Philippe and Napoleon III), followed finally, in 1870, by a third republic - which lasted almost as long as all the regimes since the first republic combined. Now, 200 years after Waterloo, France is on it's 5th Republic. But, had Napoleon not lost Waterloo it's possible that France could have avoided some of that chaos (or not... It's also possible that one of Napoleon's siblings would have just killed him in his sleep and seized the throne... They were an interesting family...).