perhaps a technical answer...
on DGCR you cannot review a course unless you have marked it as played. i wouldn't mark a course as played if i had only walked it. and i wouldn't consider such a review a legitimate one.
there is a really slippery slope here also. i could probably write a convincing review of a course i've never even been to if i read a bunch of other reviews, heard others discussing the course, maybe saw some pics or watched a little footage. particularly for generic courses like a typical park course or an elementary school course. that review might be accurate, helpful, and contain no falsehoods but it would still completely lack any integrity. if we were to accept reviewing a course that had only been walked then why not one you've only seen on video or in pictures or heard described in conversation.
then of course, there's my personal opinion that a good review is one that describes the experience of playing a course which i can't imagine being communicated effectively by someone who hasn't experienced it.