That was the main selling point, though, as I understand -- that you can eat Soylent 100% or hell, 95% of the time, and you'd be healthy and not die. And most people were actually complaining about that, that everything's been so rushed.

Soylent in its current form is nothing new. I am no authority, but it probably isn't the best either, with only a few mere months' worth of research. I'm sure this product isn't going to be an impending health disaster -- I doubt anyone would be dumb enough to eat Soylent till they die. But there are alternatives out there (the OP mentions a few) that are likely better-tested. Soylent's one claim to fame may as well be its better marketing (pretty much everyone in that company's a marketer).

Agreed. I think it could be a useful product, even if the majority of people probably would not want to replace all of their meals with it.