I generally have a variety of places I get my news.
Plenty of centrist/ left-wing sources were critical of CNBC.
http://www.slate.com/blogs/moneybox/..._was_cnbc.html
https://www.washingtonpost.com/news/...ential-debate/
While anything written even a few hours after the debate is tainted by Priebus' statements, the initial responses on twitter and live blogs didn't suggest CNBC handled themselves well.
And if the CNBC hosts did an awesome job, there'd be pushback against Preiebus' view.
There were certainly other factors.
CNBC has a reputation for snark that doesn't play well in this kind of debate format. The moderators weren't all ready for this kind of exposure. The main point of a CNBC debate was to have a discussion that focuses on economic issues, but the moderators often went outside that wheelhouse.