Well, to be fair, using 'ou' in English seems almost intentionally misleading as the default pronunciation would be 'ow'. There are, of course, exceptions (as there always are in English). Four and tour come to mind as counter examples. To an English speaker, Cho would be more obvious. Even Choh or Choe and they would probably get it right. In American English at least the sound in goose and chew are pretty much the same.
To me, the correct pronunciation of wabi-sabi is the natural one but I suppose I can see how someone would get that wrong too...though you wouldn't think someone voicing a documentary would.
I took a semester of Japanese in college (not that I remember all that much now). Speaking/pronunciation actually didn't seem all that hard. Reading and writing on the other hand...