Yes, quality is subjective.
With SMTs on the way, and Dan building a competitor on EOS, not to mention any forks of either, I'm sure we'll get plenty of opportunity to see all sorts of different settings play out in reality.
For example, Ned appears to be making account level voting an option for SMT's and/or quadratic rewards.
Those who lean toward fairness (whatever that is) can launch an SMT with account voting and linear rewards, and those who lean toward quality can have stake weighted voting and quadratic rewards.
Then we can race our preferences against each other and you'll get to see how right I am ;p