To compliment the helpfulness of a review. Click on the thumb icons on the bottom of a review to rate it as "not helpful" (one thumb down), "helpful" (one thumb up), "very helpful" (two thumbs up), or if it's amazing, "remarkably helpful" (three thumbs up). The idea here is to focus on rating reviews based on the usefulness to the community, and not on whether you agree or disagree with the opinion. The ratings your reviews receive go towards your Top Contributor ranking too. Knowing that your reviews are rated according to helpfulness inspires the community to create better, more thoughtful content.
Furthermore, you can compliment a review as "thought-provoking" (light bulb icon), "fun to read" (happy face icon), or "well-organized" (pencil icon). You can also give more than one compliment to an outstanding review. Keep compliments in mind when writing reviews, since the compliments you receive will also factor into your Top Contributor ranking. To see the community opinion of a review, at the top right corner of the review is a count of people who found the review helpful, thought-provoking, fun to read, and well-organized.
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And I'm with ya on that. Furthermore, I'd rather be in a diplomatic environment where even if people disagree, they're mature and respectful enough to agree to disagree than start a flame war of some sort.