I've been reading Hagerty reviews regularly for about a year now (new insurance customer), and so far the only way I notice Hagerty is different is in the frequently hostile comments to the articles.
The current Corvette is not to my personal taste, but that doesn't mean I feel compelled to bash it (or the routine practice of manufacturers providing loaner cars to journalists). I also don't find it upsetting--or even a little bit surprising--that this article on the GTS expresses opinions similar to one in autoblog or a dozen other sites. It's not a conspiracy, it's just a common opinion.
In addition, articles like this are helpful to get a sense of model ranges, option packages and general impressions from folks who drive a lot of cars and are good at communicating their thoughts. Whether a particular car is ultimately worth the outlay of hard-earned cash, though, is IMO an entirely personal decision that is best not made based on somebody else's opinion anyway.
And finally, since this article is more straightforward, complete and well written than many such reviews, it's hard to understand what all the ire is about.