I think a lot of the value really depends on the individual. If you're engaging in productive activities like hobbies, you get valuable targeted ads. If you're engaging in activities that are low value like signaling to others in myriad ways, you probably get adds for things like disposable fashion.
Personalized ads are basically a mirror. They feed what the person already wants to engage in. If you want less of the bad types of advertising, then you need to start at the root which is getting people to stop being interested in activities and behaviors that are lower value.