I think the doomsday forecast is a little premature. And I believe we've already addressed the issue of relevance.
In the end, it comes down to this: this was a brief, unassuming article announcing the launch of an app that wants to provide users with a platform to share customer reviews and compare items they are interested in purchasing. This, like all apps, will appeal to certain people while others will not find a use for it. You, uglyduckling81, clearly fall into the latter group; RedJaron, who asked about a Windows Phone version, likely falls into the former. The app is free, it is optional, and this article explicitly uses the electronics category as an example because that is our audience, while also clearly pointing out that it is not yet up to par with enthusiast standards.
Believe it or not, people do come to Tom's Hardware to make purchasing decisions. It's part of why reviews are a popular feature and why there are so many forum threads asking for purchasing advice. The app provides an alternate means to get that advice. I like to think of it as an optional, free supplemental resource being offered.