Strange, from memory it was the exact opposite. The brand names actually had decent flavor/texture, while the off-brands had humongous amounts of sugar, to the point where you actually taste the sugar rather than it just sweetening the overall flavor.
Ugh, I feel unrepresented. I sort of remember where I was, read a bit to see if I recognize it, and then skip a little forward or backwards depending. I have definitely skipped entire chapters before because the style/sentences sounded like what I remember.