- relatively new website
- relatively few incoming links
Those two reasons alone are usually enough to keep your site from top rankings, imo. Don't remove your site from either wikipedia or dmoz, instead focus on building reputation/content quality and the problem will work itself out. Google will, eventually, expire anything that is holding your site back. I'd be surprised if they didn't snip your sites ability to rank for a keyword based on its age alone but Google is not worth fretting over in the long run, your visitors are.