A lot of the issues people have with Soylent seem to revolve around making it the only thing in your diet for extended periods. You're right that this is not how they are pushing it. I would never want to replace food with this entirely. If I were planning to have Soylent for dinner but some friends called up and asked if I wanted to grab a meal with them, I wouldn't hesitate for a second.

Because of this I don't worry if it's healthy enough to be the only thing I eat for a month, or if I would miss food, or be less social. This will never, and isn't designed to, replace all food.