I live here and it's all propaganda. From my lefty perspective there are no shortage of things to criticize about California, but most of the criticism in the mainstream comes from the right and more or less 90% of it is made up.

Example: last year San Francisco elected a DA who said that they wanted to reform the justice department, used Black Lives Matter rhetoric, etc, and the conservative media sphere drummed up a propaganda campaign against them and against San Francisco generally that convinced everyone that a spike in crime had occurred even though there was no actual evidence that crime had gone up (and even if it had the new DA hadn't been in nearly long enough to be the cause of it). This resulted in that DA getting recalled and replaced and everyone outside the state thinking that San Francisco is Mad Max, even though statistically things are basically exactly the way they've been for the past couple of decades.

The real problems are what other people said, things are expensive and the cities have a lot of inefficient sprawl which makes the cost of living worse and starves the city governments of funds for social services. We've been staring down the barrel of a water crisis for like two decades and the state government is seemingly incapable of taking any action on it, we spend way too much money on cops, the government is completely captured by the local industries, the only thing we seem capable of doing to homeless people is systematically brutalizing them - but none of those problems are unique to California.