No that isn't horrid, but it shouldn't really be the only measure. Advertorials can be such a long sell you might not want a really high ctr, meaning links in the beginning might be bad for conversions. I would make sure you are monitoring the overall CVR of the path because there does become a point where CTR and CVR can be inversely proportional
I can get my advertorial CTR to 80% easily. CTR is not the issue. What is your EPC from Advertorial to Payout? That's what matters. If it's under $2.00 then GTFO.