Really depends which supermarket and which location. The large supermarkets have a large choice (though you are right, not on par with the French, Dutch and Germans!). We do have a lot of local bakeries though which fill in the gap left over.

Now compared to the US (and I'm sure there are areas where you can be well served) it is a desert for bread. You may get the odd 'artisanal sour dough loaf', but the very fact it's shipped from california and will last 2 weeks makes you wonder!