Yes, although Napa is great if you love expensive and overripe bombs full of brettanomyces!
Some good and even some great wines come from Napa, but they just can't compete with the diversity of Sonoma County. We can easily school them on pinot noir, chard, zin and even cabs if you head to Alexander Valley.
I'm biased, but I do a LOT of tasting (and have worked for wineries) in both regions and Napa just can't compete with any regularity.