NFL football is a funny game. Although the offensive line is unquestionably critical, it does not always result in a poor result. There are so many other things you need to take into account.
For instance, a team that catches all the breaks in game one, predominately resulting in good field position in many cases, reserves it's offensive line. The result is often a fresh offensive line the following week.
Other things you must take into account is the offensive line coach. How well does he prepare his players? A lot of times under a new offensive line coach, linemen that seemed washed up last year under other management, take on new life.
Don't condemn the offensive line until we see how they react under the new circumstances.