Amen. I recently left a company that got stuck with an inept development partner. After two years, their “groundbreaking social networking platform” was still riddled with bugs, a very difficult UI, and an unworkable development process. Instead of circling back to examine core problems (including management issues), the programmers pressed-on adding additional features to try and placate their users, effectively increasing the bugs by orders of magnitude.

Sunk costs mean nothing. Lick your wounds and find a better developer.

Another tip, visit the company headquarters. Meet the actual coders. Ask how much of the work is outsourced. Decide early if you really want to work with an entire company. If you have the connections, you can find an individual coder who can produce better work, better responsiveness, in a shorter amount of time. One capable programmer at a higher hourly wage is MUCH more affordable than a company of less-capable developers at a cheaper rate.