Good graphs help convey your insights about the system you have built and/or measure by providing the information your reader needs and wants. Bad graphs can leave the reader baffled, squinting, and drawing the wrong conclusions about your work. While it's not reasonable to expect astonishing insight from every graph, you can always make the readable and easy to interpret.
A research paper's task is to convey the insights of your work to your audience -- first the reviewers and then your research community. To get published, your paper must satisfy the program committee. Once published, it has to hold the interest of other researchers and engineers. If it fails at either of these tasks, it will not have the impact it should.
You've done it! You have played the key role in a compelling piece of research. You are the first author. You get the glory, but you also have a lot of work to do.