Which states have good community college -> state university (including flagship) transfer pathways?

The discussion in http://talk.collegeconfidential.com/parents-forum/1811484-who-has-to-go-into-debt-to-attend-a-reasonable-college.html mentioned community colleges as a low cost option for some students, but some mention that the transfer pathway is much worse in some states than others. So which states have good transfer pathways for students to start at community colleges and then transfer to state universities (including the flagship) to finish their bachelor's degrees? This means that most students attending college full time in most mainstream majors will be able to complete the frosh/soph prerequisites for his/her major, be admitted to a state university according to his/her academic performance, and graduate at about the same time as (or no more than a semester later than) they would have if they started as frosh at that state university. Assume that the students are not the outliers who are highly advanced in the subjects of their majors by the time they graduate high school. Or, to put it another way, for most college-ready (not the academic superstar) students, if they had budget or other constraints that make it difficult to start as a frosh at a state university that they want to attend, would starting at a community college be a reasonably attractive option from an academic and cost standpoint?