"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." -Manuel II Paleologus
The legislative minority does have considerable power under California's system but that power is dependent upon the cooperation of the executive in all but isolated situations.
California's financial circumstances would be much different today if the governor had decided to empower the legislative minority after taking office. Legislative Republicans do have the power to derail the majority's agenda but not without the consent of the governor.