Disappointing Vintage

We opened a bottle of Camel Valley Brut 2009 last night. It was only OK, not as good as the '07 or '08 vintages. This one was much greener smelling and tasting - a bit like the endive that was in the pasta I made for dinner, including the touch of bitterness. It also didn't hold its bubbles through the glass, the first time I've experienced this with a Camel Valley sparkler. Perhaps age will help this one? But for now, I'd stick with the older vintages.