To me, some level of bias and preference matter very much so considering how vast individual's subjective tastes, tolerances, thresholds and wallets are. What may be important to someone may not be another -- where one places value may differ from another. It's wonderful to read observations or why their choice was right for their needs.
Forums are a great place to share official data, facts, third party views, reviews, findings, investigations, personal preferences, which may encompass a great deal of subjective from value; to performance; to features; to gaming experiences, etc..
A little respect, kindness and tolerance goes a long way in forums. Forums are not ideal but again, there is a lot of good and personally don't allow idealism to be the enemy of good and simply post around forum mines and allow the moderators to moderate.
What difference does it matter if one is one sided or pro nVidia or pro AMD -- simply don't expect everyone to be extremely objective or balanced in forums.
I am pleased that both AMD and nVidia offer compelling choices for one's subjective taste, tolerance, threshold and wallet. When I read the bickering I have trouble understanding based on the the great choices one has to consider.