I love DigitalRev's videos with Kai and crew and have watched the majority of the views on Canon cameras and lenses.
Maybe I'm just not remembering correctly, but I don't think he's very negative in most of his reviews. In fact, I've found it frustrating at times, because if he's doing a comparison review, he usually seems to come to the conclusion of "both are very good cameras, just different". So I've started taking the cynical view that because DigitalRev sells stuff AND because they probably want to maintain good relations with the various camera companies that probably supply some of the items to be reviewed, that Kai tries to avoid too much negativity in his reviews.
So when he does get a bit negative and points out a feature of a camera he dislikes (such as the AF speed on the EOS M) I take it pretty seriously




