I recently perused syllabi and reading lists from one of my favorite economists, Deirdre McCloskey. One of her reading lists, Reasonably Painless Economics (pdf), included the following counsel:
Do not read Paul Krugman! It’ll gradually rot your brain, until you can’t think straight about anything. Do not read Freakonomics, either, from the opposite politics. It too will corrupt you!
That is very good advice.