This is so dead-on. Having the idea is often the easy part—it's the execution that makes or breaks it. Yes a great idea can be valuable but it's nothing without the execution to bring it into reality.

Conversely, ideas which appear shitty or idiotic in their failure (Juicero, for eg.) might have thrived with sensible, correct execution.

This is why having the right team matters more than having the right idea and one should take a hard look at oneself as much as the product when facing failure.