I'm a current graduate student at WGU. From my experience, most courses are well laid out with syllabus, required reading, exercises/papers/tests to judge competency of the subject matter, some classes have video lectures others are based solely on the readings and exercises.
It is self guided in that you can go at your own pace and like a traditional brick and mortar institute, you can put in as much work as you deem necessary to pass a class.
My view is that I'm getting my degree for a reason, so I'd rather walk away with something more concrete than the diploma. I actually really enjoy the structure (or lack thereof) as I struggled quite a bit during my undergrad at a traditional school with the slow pace of most classes.
I'd probably take a dumpster over an open office plan though so take that for what it's worth.