How do other people use (product) reviews? Are you putting value on the reviewer's opinion?
If the person doing the review has already earned my trust, my trust drops a notch, but I won't discount the review. I'll just be more vigilant about the reviewer into the future.
No affiliate links means they're paid to review. Affiliate links means they get paid for people visiting.
Basically someone gotta get paid to put in the work. It is increasingly bad as a practice to review things negatively. So generally incentives work towards good reviews.
One sign though that a review is very biased... If they give you a discount code. They are not reviewers, they are salesmen.
1. Reviews by that author/site are exhaustive, not one-paragraph reheated press releases.
2. Reviews by that author/site are sometimes negative. A site that has all positive reviews is just a marketing brochure.
I am also more forgiving of affiliate links when it's a random nobody/blogger/Youtuber who is making money solely from affiliate links. What's slimy is when big magazine brands double dip on affiliate links and display ads -- e.g., "Hey, REI: we'll push all our affiliate links to REI.com if you buy X number of ads on our website."