I don't know if it's still the case, but when I was involved for ~18 months ca. 2007/8, the cleaning products were actually very very good. I heard from others (not affiliated with Amway) that back closer to the start of the company they were some of the best non-commercial cleaning products you could get.
But I agree with you that nearly everything else was garbage. Some of the food was good but I was not concerned with health in 2007/8 so it may be garbage from a health/nutrition standpoint.
Nobody joins Amway because they believe in the products, they join because they believe in the pyramid concept.