I imagine:
Useful: companies/reviewers who still want to attend Apple's keynotes
Gimmick: honest reviewers & pissed off (Pro)fessionals who're angry Apple focusses so much on this while happily removes ports we all use, making their newest iPhone incompatible with their laptop without a adapter (still lol) and making the laptops even more expensive.
My thoughts:
I obviously haven't tried it, but I guess the Touch Bar works well. It's probably really smooth and responsive. But I just don't think it's that necessary. While you're working, you'll constantly have to take your eyes of the screen (as the vid said) and this will not make you more productive. + If you're at home, you're probably using a external monitor with a keyboard and mouse. And then, it's suddenly an annoyance if you wanna reach it. Your laptop might be to your side on a stand (like my Air) or even in clamshell mode, meaning: bye bye Touch Bar.
It's strange they didn't think of this and released a new keyboard with the Touch Bar built in to promote it's usage.
In the end, I think Apple is kinda out of touch what people really want. They probably know it, but they just don't care anymore. A thinner laptop is all that matters.
I'm thinking about the poor employees at stores who will have to explain to everyone (not us nerds) that they will need various adapters to connect their 'old' devices because the MacBook 'Pro' is too futuristic.