It's visual confirmation that General Relativity, which we've based all theoretical physics around for decades, is definitely correct. Black holes were once believed to be probably not real at all, and it's pretty amazing that we can now see them with our own eyes.
Also the techniques used to get these images is groundbreaking stuff. The final result may not be all that spectacular visually, but it's a great stepping stone. Imagine what we might be able to see in another 50 years from now.