Is every one objective? How could they be?
Everyone is biased because everyone is basing their replies on their own experiences and those experiences are limited. But if we have many members having the same experiences, and we base our opinion on that, it is much less biased.
If I have a negative opinion about Gerber, it's may be because the last couple of their knives have not delivered the quality and performance I was looking for at the price I paid. But that was my experience, and if you have had a positive experience with Gerber knives and you comment on it, that's good. Because I only bought two Gerbers that dissatisfied me. That is a tiny sample size. It may be enough for me to decide that I will buy from someone else, but does not mean that all their knives are bad. It just means that the two that I bought in the last few years don't match quality or performance of the ones I bought 20-30 years ago.
So, we pool our experiences and we get a more complete answer. That is why I spend way too much time here on the forums. I will never own all the knives I want or multiple samples of each knife to sample the variation in quality within a single line. But by combining my experiences with those of everyone else, I get a fuller picture of what works and what doesn't. Gosh I could learn that the Gerber LST knife is still a good deal and delivers value for the price. (Which I did a few months ago here.) That means that I might consider buying another one of those if I needed a new knife of that style at that price point. Good boogie. Moreover, I may find out that the two knives I bought were both exceptions to the rule and that most of that model give good value for the dollar. Hasn't happened, but it could. That would be good to know also.
But my single opinion is going to be formed on my own limited experience and is, therefore, biased. The only unbiased opinion will be a shared opinion based on many knife styles and many samples of each knife.
I cannot help it if a lot of us have been disappointed with recent Gerbers or if a lot of us have had positive experiences with Spyderco knives. If there were only a few such reports, it could be due to exceptions or flukes. That there are many such experiences means that the joint opinion is most likely valid.