1) Google intends to drive affiliates out of business (but then we already knew that).
I've been looking at a lot of digital camera review sites whose monetization is from affiliate links, and they seem to do quite well, all filling up the top SERPs; Despite the fact that these sites are not famous "brands", they generally outrank the manufacturer's sites, as well as the well known tech sites out there
They don't try to cover up that they are affiliate sites; they proudly state that if you find the review helpful, please purchase through one of the affiliate links on their site.
They do provide TERRIFIC reviews of the cameras, usually providing side by side comparisons of some of the closest competition to each model. As a shopper, it is hard for me to imagine people who WOULDN'T find a lot of value from these particular sites.
So while I am sure that google is now classifying more and more affiliate sites as "doorway" sites, if you have something very helpful, like independent side by side reviews, I don't think there would be much problem ranking.
(Apologies to moderators over use of keywords: I just thought mentioning the specific types of products would better illustrate the example than using "widgets".)