Well, it's kind of true to me. When I first got MBP 15 3 weeks ago, I always heard the super drive cracking on start up (no on wake up). Last week, I put a DVD movie in the drive and OSX asked me for the region. It was set to region 6 (China) as the default (probably because it's made in China). After I set to region 1, I just watched the movie.
After that I rebooted the BMP a couple of times (usually once a week), to my surprise, I did not hear the lound cracking sound any more.