I think one possible answer is that maybe the average consumer is just used to the thinner, weaker , less full sound that comes from the small speakers that most home speaker manufacturers sell.

As one guy put it, we as people might percieve change as bad
regardless of what direction the change is. Since the Pi speaker sounds different then the run of the mill speaker it may register as sounding worse when in reality its actually the more accurate speaker.

Ive spent alot of time with my Pis and have tried carefully considered their sound and tried as best I could to be open minded about it, my conclusion is that these are some of the most accurate speakers I have ever heard.

Discuss amongst yourselves.