Is it too early to worry about Astros' struggles?

The Astros are 4-7 to start the season. They pulled off an impressive win Monday night against the Texas Rangers in Arlington.

But they did so after their top pitcher Framber Valdez was scratched with elbow soreness, and the rookie sent to replace him put in a rough major league debut.

When is an appropriate time to start worrying? Payne and Pendergast discuss it here, before the Valdez injury.