The human mind learns so badly that generation after generation make the same major mistakes repeatedly - even when corrective information is passed along as folklore or more formalized knowledge. Aside from all this, it can't fly, swims only in a most inefficient and risky manner, and is generally weak and vulnerable, lacking innumerable design benefits that many other creatures in our ecosystem enjoy. On the other hand, if we are to explain the human body as an evolutionary result, we can both see where many problems may reasonably have come from, and why some things are improving with the application of human expertise and resources. As humans develop more technology, we are living longer than ever before. Even our teeth last many times longer than previously as a benefit of our growing technological prowess.
Babies are much more likely to survive at birth, as are mothers.
An abdominal stab wound was essentially fatal until about a hundred years ago. Now it's almost never fatal. Clearly something that requires the hundreds of vitamins and minerals that the human body does is the result of survival of the fittest in a wildly complex environment rather than a caring design for perfection. Furthermore, as we learn the genetic code our ability to understand why things are as they are in our bodies grows by leaps and bounds, and solutions are already presenting themselves for many previously intractable problems. We can also see how to avoid these problems.