For the purposes of law school, regional accreditation is sort of irrelevant. The only accreditations that matter are those from the ABA or a state bar. The vast majority of lawyers (employers) will view an online degree as "unaccredited", even though it is technically accredited. Maybe one advantage is that you can get federal student loans if the institution is regionally accredited?
Personally, if I were considering the online/correspondence route I'd look at 1) cost, and 2) bar pass rates. Most employers will frankly be skeptical of any online program, period.
As Citylaw said, online programs can be the right choice for the right student. The decision requires a realistic assessment of the applicant's goals, and where they want to live. For some people, it's the only chance at obtaining a JD, and can be a good choice.