As much as I love my Japanese music, I don't think that there are less crappy Japanese groups than any other country, just more good groups so it is easier to get the good from the crap. As a big metal head there are a ton of awesome American metal bands but because I prefer European style metal there aren't so many that I enjoy. Japan provides me with pop singers who to me have better voices than American pop singers. The music is just as generic in some cases (Stephanie/Kyosuke Himuro) but generally easier to listen to because of the fantastic singers. On the other hand there are groups like Hyde's stuff with VAMPS, L'arc etc, Angela Aki, Kokia, Aoi Teshima, Bump of Chicken, Kalafina (and anything done by Yuki Kajiura) that are a bit more original and shine through awesome song writing and vocals. In the end it just takes someone who appreciates good music to enjoy the great Japanese groups out there. I think VAMPS and Abingdon Boys School would be uber popular if they were to attempt to take on a slice of the American market one way or the other.