You are drifting into an extreme definition of fanboy. Disagreements are perceived as hostile based of your platform of choice. That was bunge argument I think. The perception of what is promoting discussion ,or not, is also tainted.
Your distinction of positive vs negative is what I disagree about. That's a recipe for starting a high brow official technical spec discussion about xbox with 10TF and a slim the size of an apple tv. And the negative posts are the fanboys saying it's a ludicrous source and impossible specs.
If I take your extreme example of repeating the same thing over and over, that would equally apply to those repeating false things that are positive, or true things that are negative. In that case, the negative ones are beautiful, and the positive are ugly. Regardless of assumed motives.
A positive feedback loop is dangerous. A fair amount of negative comments create a negative feedback loop so it's a stable system, fanboys stabilize the universe. They are the heros we need.