Will you review a site which with high PR? for example: 3+ ? Will you approve a site which is an adult directory?
Any site should be treated the same as to how it's evaluated. I really don't care if your site is a PR9 if the submission has not followed the rules. Since mine is a niche directory, if the site is off-topic or doesn't complete the submission properly - it's gone before I ever see that green. Adult directory - not even if my directory was general. Just not interested, sorry.
I think PR is not the only measure to evaluate the importance of site. A unique site can also be more important than a site having PR so do it for good sites