I actually disagree with you guys. They're facing some random NL Central opponent. I think the Marlins series will be much more telling.
Who they have historically underperformed against and gone into a tailspin after facing. How we do against the Marlins will say more about our chances to legitimately contend in the division. Facing the Astros is just a "is this team for real" kind of test.
Just my opinion of course.