The last CD player I had (remember CD players?) was a "high end" player. I'm not an audiophile, and couldn't tell any difference in sound quality. But when it came to playing scratched CDs, it performed much, much better than the "low end" players I tried.
Similarly with DVD players, my dedicated player connected to the TV deals with dodgy discs better than my computer does.
I'd guess something similar might happen for blu-ray, at least with legitimate "high end" gear. There is a lot of processing what needs doing between the pits on the disc and the electron flowing down the HDMI cable. The accuracy of the motor speeds, the quality of the lenses, the error correction processing... cheap gear probably skimps on those things. As long as your disc is in mint condition it won't make any difference. But as soon as that's not the case... (although ironically those with high end gear are more likely to keep their discs in mint condition, lessening the need for high end gear)