First, they had an invite wall when I signed up. I was ~4000th in line, but they let me in anyway. This was their first mistake.
The bigger problem is that their service is just a simple middle man. They don't provide delivery services, they just choose which service to use. For the examples they gave (food delivery, grocery delivery, airline tickets), it's never going to be worth it to me to have them charge me an extra 25% to pick between the three services that will do that for me (Postmates, Instacart/Postmates, Hipmunk). What's more, SMS makes it more difficult to order. Postmates' interface is much better than trying to text an order in.
It's not that this is just an MVP. It's that this service really only takes away the decision of which other middle man to choose, and there's just not enough value there.