Gonna ask my gastroenterologist before I take the dive, but yeah everyone seems way too eager to look down on the idea.  I understanding not wanting to replace every meal, but there's totally a place for this kind of thing if done right.  Think about what such a product could mean for developing nations also. 
Real food? HomieDon't
Soylent wouldn't be my entire diet, but it'd make my life a whole lot easier.  
This might be a result of my health issues but I've developed a very boring utilitarian perspective on food.  I don't get excited about it.  I don't like cooking.  I don't look forward to eating unless I'm really hungry.  I don't actively dislike any of these things either.  I just do them for survival.  
Detractors of the product, 
like the author of this NYT article on it have a more romantic relationship with food than I do.  
The longer I used it, the more Soylent began to feel like a chore. I began to yearn for the mechanics of solid meals — chewing, swallowing, using my hands and silverware and experiencing a variety of textures and temperatures. I missed crunchy foods, salty foods, noisy foods and hot foods. (Soylent, like revenge, is best served cold.)
I don't care about all that.  The only thing I would miss about eating is the communal aspect of it.  I've gotten to know plenty of friends better by sitting across a table with them for lunch/dinner or whatever.  Aside from that, eating is pretty much like taking a shit.  Something I just do when the urge comes.