I am working as a leader of 3-people team in a software company of about 200. I am currently looking for a new job. The main reason is that the company is on the wrong track. We are not in financial trouble yet, but in my opinion the product is doomed. It's beyond my power to change this, but it's my responsibility to do my best in my area of the system. Seeing the future in dark colours really affects my job satisfaction.
Assuming my view on the company is correct, how do I answer the inevitable interview question "why are you leaving?". I know that I should prepare a lame phrase like "I'm looking for personal growth blah blah bla", but I'm not a good liar and I don't want to sound dishonest.