Actually, posts being reported helps me a lot. I have set them to appear in bold red in my e-mail client, and if I check my e-mail there're often posts reported that hadn't been caught yet. The admins do not see everything.

Generally, I click on reports wether there's a good description or not. A good description sometimes helps, especially if it's an offense that's a bit hidden, but I've never really had problems with descriptions (even though they are often quite bad).