Undoubtedly marketing does play a part, but Intel, as well as Samsung, apple, et.al are so successful *both* because they have good marketing and a very good product that fits the demands of their market segment. AMD apus are a decent product, but are trying to fit in a nice of those who want better graphics performance than intel, but are satisfied with performance less than a low/mid range discrete card, and are willing to settle for lower cpu performance as well.
marketing plays one of the largest roles imho, because in most products produced by the likes of samsung or even apple, there ican be other more focused, better and cheaper options that usually have less market visibility.
As for the roles of apus vs what intel offers, lowered processing power is markedly less visible than lowered gpu performance.
At worst AMD is a few seconds slower than an intel
counterpart(and vice versa), so much so that joe six pack usually cant tell the difference but if the igp performance is lacking, then it can be clearly visible. Implying that it is a bad product because it hasn't had a very good showing so far is a bit shortsided (that is like saying the dreamcast or gamecube was bad because the ps2 sold more consoles).
Also why is the idea of an APU bad yet intel does the same thing and its a success in most forumers eyes?
By the way, I could watch AMD marketing commercials every day, and it still would not convince me to buy one of their cpus, not because it is bad, but because there are similarly priced alternatives form Intel that are both faster and more efficient for the uses I am interested in.
good to know that you are a great stand in for the majority of people, a one man survey.