To be honest, I am one of the manga addict. I have read tons of manga comic. And currently I am following around 10 active manga weekly. I am sure some will said reading comic is for kid, or that comic is not good compared to reading news paper of text books. The statement may be true or not true. Whether reading comic is good or bad fully depends on yourself.
For a good example, you can read some blog posts by Sang Asura. He managed to convert his reading into a really good advice and related to the issues that are happening in the world. Once you read the posts, you will be amazed at how matured a fighting comic actually.
If you said reading comic is not informative, you might be wrong. Most manga and comics usually use true facts in conveying certain issues. By reading comic and manga, you can actually learn about various places in the world and the culture of a places. The best example is Jojo Bizzare Adventure and Bloody Monday manga where you learn about cultures, histories, and science. It’s actually up to the reader to choose informative manga or useless one.