Are Sunday mornings irrelevant?

So, I just finished watching a video that a friend asked me to watch.  The message was good and thought provoking, but is he suggesting that Sunday is irrelevant in the American church?  Or do you think the Sunday morning celebration time is as important as the small group community time?  Can a church be effective and have both?
I am taking to my irregular blog to post this video and ask you to give me your input.