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This is just not true, unless we have set up an agreed upon set of [u]objective[u] criteria, then better or worse, good and bad, ARE just subjective opinion.
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While objective criteria are needed to assign a comparative value to an object, this criteria is often implied. As an example, "good" and "bad" are usually used in a subjective manner. We can assume, however, that everyone's opinion on a given topic will represent a graphical curve we can use as a basis for our criteria.
"Poop smells bad."
This is a subjective statement. We can assume, in relative safety, however, that a statistically significant portion of the population will share this opinion. With poop as a lower boundary of our criteria and, say, flowers as our upper boundary, we have established an implied measure of criteria. There will be people that think poop smells good and flowers smell bad, but for the purposes of our comparison, this is a statistically insignificant portion of the population.
Using these same guidelines, we can say things like "Indiana Jones and The Kingdom of the Crystal Skull was a bad movie" and "Indiana Jones and The Raiders of the Lost Ark was a good movie." There will be dissenting opinions, of course, much as we can find a person that states that lava is not hot.
This implied convention is usually in place. When someone makes a subjective statement we must ask ourselves if that opinion is likely to match a significant portion of the population. An opinion that is likely to coincide with a statistically large portion of people carries greater weight, not as much as a fact, but enough weight that "But that's just your opinion, nyah. Some people like poop," isn't an appropriate counterargument.
I'm not saying that I agree that these elements were implemented poorly. I believe that forum-goer was in a statistical minority. You cannot, however, assume that an item cannot be measured meaningfully in subjective terms.
Poop does smell bad.
