To be honest, I am not a fan of sparkling wines, and I must admit to a prejudice re Californian wines; these days, you don't see many of them in Europe, but in the 80s, Blossom Hill and Paul Mason, were vinous horrors that infested every mid range store that sold wine.
The problem with French wines is that they tend to keep a lot of their good stuff for themselves. At the bottom end of their market, they are supremely indifferent to consumer response (indeed, at the top end - as I discovered last January when two bottle sod outrageously expensive sauternes proved undrinkable, they are also relatively indifferent to consumer complaints).
Deep down, I suspect that they believe that everyone else is an utter peasant, lacking sophistication and an educated palate. And for year they were (almost) right. This meant that they got away with murder in the wine trade, off-loading inferior stuff to Northern Europeans who couldn't tell the difference, wine which sold on the fact that it appealed to the sort of consumer who thought (and I was one of them) that it was 'cool' to drink French wine.
However, the rest of the world woke up; the New World improved, and delivered value and consistency, and some of the Old World (Spain, Italy, and latterly, Portugal modernised and became better known and marketed).
Actually, Spanish and Italian wines (of the Old World) have really improved in recent decades, and excel for quality, consistency and offering good wines at affordable prices.
The upshot of all this is that to ensure consistent quality from the French you have to move up the price range. Most of my French wines are at a price point between €15-27; I rarely - actually, never - buy anything under €10.
Re Chablis, and French white wines, I had an epiphany two and a half years ago. Once, home on leave, my wine merchant friend gave me a Meursault (which is yes, a wicked price, but worth it as a special occasion wine), to try. I was bowled over, and since then, like rich tasting and full, but balanced whites.
Cheaper whites are too thin, and tasteless, to my mind, and some of the grapes used are lacking depth and flavour. Chardonnay needs to be tamed and balanced, thus, I now think that Old World chardonnays are far superior to those on offer from the New World which tend to be over-powering and bloated.