Karl Marx and Keynes were also economists… That is a broad scientific/philosphical field we are talking about. But there are many opportunists and demagogues in that field.

I used to work in science in hydrology and did read a lot of papers from macroeconomists (they use similar apporaches). There are defintly serious scientists in macroecomics. Tbf, I have my doubts when it comes to business economics.