I believe that any post is fine, as long as it fits into the posting rules and it's somewhat intelligent. One liners are fine, but I've seen people post NOTHING BUT one liners on other boards...it can get annoying.
As long as the post is on topic, isn't 15 lines longs with no page breaks, has punctuation and isn't just one big ramble, it might be worth posting. Even if it goes off on a tangent, it just might start a better conversation.