"I'm not a blogger, but I play one on TV"

"I'm not a doctor, but I play one on TV."

That has to be one of the most maligned statements in the English language. To be fair, though, a good actor who plays a role will research it, and knows more than the laypeople to whom the commercial spot is addressed.

It's a shame that the cult of celebrity is so strong that a celebrity is deemed to be a better spokesperson than someone with expertise in the field.