It indeed seems to be bad. If you try reading some papers you can find everything from conclusions obviously based on formal fallacies, confusing statistical significance with practical significance, experiment designs that couldn't provide any new information no matter how they turn out, to outright bizarre flaws of logic such as dietary intakes calculated so that the body isn't able to excrete more than it absorbs.

The medical science has decayed into a strange cargo cult where experiments are made and papers are written, but the essence of science, the pursuit of better understanding, is lacking. It's no wonder there has been no major progress in the last few decades and we have an epidemic of obesity and other metabolic disorders.