Well, ritekg05s can be less than stellar when compared to other burns with other media, true. It is also true that sometimes the ritekg05 line has QC problems, so the quality varies from spindle to spindle. I've had good results with ritekg05s in burning in both my px-716a and Pioneer DVR-108. However, due to the seeming increase in quality variability, I feel more comfortable with something like Fuji DVD+R 8x 50 pks Made in Japan that Best Buy sells (yuden000-t02-00 mid), as they nearly always give me very low PIE and PIF. Those results tend to spoil one!
(edit--added) Also, some people have had very good burns with the MXL RG03s, but it depends on the burner. Oddly enough, some burn graphs have looked like genuine MXL and others look similar to a write strategy for ritekg05.