As a California resident, you should apply to all UCs, including Riverside and do not stick your nose against it because it has the highest number of openings for its Early Assurance program to UCRSOM. There is no bad medical school in the US as Residency is the determining factor for your future prospect.
Your chances to get in med school is just the same whether you go to any UC or those high priced private “Ivies equivalent”. What you do is what makes the difference, not the school.