People who claims Steem to be unfair, are in general those who lack the support they themselves believe they deserve.
I don't think that Steem is fair at all, but that doesn't necessarily mean that I think it's unfair. I can honestly say that I don't appreciate shitposters raking in $100+ per day or week. I'd rather see other authors who brings quality get that portion of the rewards.
However, quality is in the eye of the beholder. Which is another important thing to remember. What I believe is quality, others might think is garbage.
People have to realize that all these beliefs of how much you are worth or what you deserve doesn't mean much for others than themselves.