Feedback is critical to all designers, freelance or otherwise. Sometimes the designer fails their communication check and sometimes a reader fails their comprehension check . It is a smart designer who looks at what is said about their work and tries to learn something from the feedback, even if the failure to accurately communicate doesn't really fall on the writer.
Readers have a reasonable expectation that the writer will convey information easily and clearly. That kind of skill comes from practice. RPG Superstar is Paizo's way of finding people who are creative and untried, so as a by product of the design of the contest, the contestants are not going necessarily going to have honed this skill. But, they also cannot defend the choices they've made, by the contest rules. It does't make their design weak, it may simply mean that their communication skill is not as high as it could be.
There is no shame in having a reader not understand your work, the shame is not listening to that feedback and not trying harder the next time. I have sighed more than one sigh of relief for some stranger coming to the defense of my work during the last season because someone didn't understand something I did. I don't feel it made my design weak, it just meant that a misunderstanding was cleared up and I didn't have to sweat it. I may not be so lucky when my adventures get published, so I take all comments to heart and I hope that this season's contestants and voters do too.
Monica, I will make you this promise:
I will read your adventure all the way through when it comes out, review it, post my review, and shred everything you wrote if absolutely necessary!
>:D
EDIT: To those who may not have gotten it, I was just kidding. I strive to be completely honest and fair in my reviews. Therefore I will only shred it if it stinks up the neighbourhood. No pressure! ;)