I am in the UK so haven't tried. All I've seen review-wise is a particularly waspish piece in The Guardian:
https://www.theguardian.com/tv-and-radio/2020/apr/06/quibi-s...
I'd welcome something more nuanced - unless it really is that terrible.
If they are going to stick with this approach they are going to have to rely heavily on "showing" not "telling", which can really make details explode throughout the story or alternatively, reveal how shallow the content really is. I think it's too early to write it off completely, the niche will still be there when the world resumes turning, but they will need more engaging content to be successful. I think there is a chance to explore low cost/high talent sources, maybe find some diamonds in the rough. Or even just the right person who maybe doesn't excel with a 45-90 minute run-time but can blow 15-20 minute sessions out of the water.