According to the W3C accessibility guidelines, a site that wants to achieve level 1 accessibility should:
Use the clearest and simplest language appropriate for a site's content.
Closer inspection tells us that we should:
- Favor words that are commonly used. For example, use "begin" rather than "commence" or use "try" rather than "endeavor."

- Use active rather than passive verbs.

- Avoid complex sentence structures.
Source:http://www.w3.org/TR/WCAG10-CORE-TECHS/#comprehension

Does anybody agree with this or is it just catering to the lowest common denominator?
Is my site really regarded as inaccessible because I have a reasonable command of the English language and can express myself well?
Is this not the equivalent of insisting that authors write books in an easy-to-understand, as opposed to literary (thus enjoyable) style?

I would be interested to hear any thoughts on this.