There is no standard by which that was good journalism.
The moderators used up valuable time showcasing themselves for starters.
They had strategized an ambush.
They robbed other participants of an opportunity to be heard because of the aforementioned.
However, it was no ambush because there were no unanswerable questions. All the participants were able to answer the questions just fine.
What did people want, a panel of Sean Hannitys asking friendly softball questions?