In 2007 Raymond Keating formulated a Small Business Survival Index, which is a composite of various aspects of the climate for business in a particular state: business and personal taxes, regulations, mandates, and so on. In that index California ranked 49 among the 50 states. Rhode Island ranked just above California, and its unemployment rate is 12.7. At the bottom of the Index is D.C., and its unemployment rate is 12.1.
In the component parts of the SBSI index, California ranks worst of 51 (including D.C.) on top personal tax rates, worst on top capital gains tax rates, 42 on corporate taxes, 43 on health insurance mandates, 46 on electric utility costs, 47 on workman's compensation costs, rock bottom again on state gas taxes, 45 on state and local government five year spending trends, and 47 on state and local per capita government spending. It also ranks 49 among the states on the US Economic freedom index, and it has the highest state sales tax rate too: where some states have an income tax but no sales tax, and others have a sales tax but no income tax, California has both, AND it has the highest rates in both.
Anyone who says that we aren't taxed enough is either ignorant, an idiot, or both. And yes, I've heard plenty who say we Californians aren't taxed enough.