Seems like a very very fuzzy sliding scale to me.
All websites supported by advertising want their users to click on adverts - obviously.
It just depends on how much real content/useful stuff there is for the consumer at the website.
Even if there is essentially no original content it still seems to me that the website can perform as useful - it's connected the merchant with the affiliate, and is directing visitors through to the merchant, and taking a cut - exactly what affiliate networks do. As long as it's not masquerading as the merchant or otherwise confusing visitors.
Thing I get bored with is endless comparison sites. Seems to me that's been overdone to death now.