Carlton, definitely there is less value than would be provided, for example, by a product comparison rating where specific features and capabilities were tested standardly across the products, and the results published.
However, it does provide a starting point for considering the new technology entries, from companies new and old, and given how much there is to cover at the show, it helps to have starting point. i asked myself the value of paying attention to this before the show, and I decided that I could use the feature sets of the new products (and other data gained from watching them in action) to compare them to similarly promoted items.
I'd say there is more value for the vendor than for the prospective customers, but if IPVM then reviews the products and runners up in your lab—the combination would provide real benefit to your subscribers, don't you think?
However, as far as customers getting "unknowingly stuck with an ugly product"—that comes pretty close to insulting most customers I know. I have never heard of anyone making a product selection based solely upon NPS status. So I think that's a bit of an overstatement. [ Uh oh - I thought only vendors were guilty of that! ;-) ]