What should you critically read an oped piece?

Things I would ask about a writer of an op-ed piece include:

1. What is their bias, if any?
2. What is their background and education?
3. Do they possess authority on the topic?
4. Does their writing rest solely on commentary or do they include arguments?
5. Do their arguments make sense?
6. What type of appeal is strongest in their writing?
7. Do they confuse commentary with 'guilting'?
8. Do they present opposing arguments and strong evidence against those views?
9. What purpose do they have in writing the piece?
10. Would the writing and arguments earn a good grade if a college professor evaluated it?