It is hard to get listing if your submission does not follow the DMOZ faq.
Dmoz always accept optimized submission.
Er no, sorry. This is completely wrong...
I beg to differ, slightly. Some things are worse than "completely wrong", and this statement is a good example.
It is EXTREMELY EASY to get an ODP listing WITHOUT ANY KIND OF SUBMISSION AT ALL, OPTIMIZED OR PESSIMIZED. And in fact, millions of sites have done it.
Because it's not submissions that get listings. It's "websites". So as soon as you start thinking about some connection--ANY kind of connection at all--between "submissions" and "listings", you're completely cut off from reality, and the difference between "right" or "wrong" is as meaningless as any other aspect of reality.
Eligible websites get listed ... sooner or later or much much later. Suggestions are a way to help the website listing happen SOONER. But they shouldn't ever make any website get listed, that couldn't have gotten listed on its own--eventually.
And "sooner" is relative or probabilistic, since all ODP work is completely asynchronous (that is, the system is designed for work to happen in any order and at any speed.)