I spent a lifetime wishing I could go to Australia and play those courses, esp. the most famous at Royal Melbourne. When I got there, I felt they were at least as good as my imagination had conjoured up. And, the other courses were surprisingly good.
I am the type who tends to be dissapointed in any movie (or golf course) that has a lot of hype, so to not be dissapointed at all just increased my love of those courses.
I also learned a lot about Mac and how they sought to make courses playable yet great tests. I played RM, a world top 10 in almost any book, three times with my hundred plus shooting wife, and we never exceeded 2:45 Minutes of total playing time, including, one round following the ladies league. I don't recall losing a golf ball. It may have been my first relatively untouched Mac course, and I did look past the history and fame (although I do love that about RM) to see why the architecture made the course so enjoyable. It convinced me to be certain I had my greens and tees together, use light rough and build better looking bunkers, among other things.
IMHO, those courses are not overated, and anyone who does so might be dissapointed that they aren't tougher than they are in normal play, but that to me was part of the beauty of those courses.