Should We Be Worried About ‘The Avengers’?

The dialogue looks great and quippy. Mark Ruffalo may prove to be the first plausible on-screen Hulk. We’ve got a fun look at Cobie Smulders as Maria Hill, though every time I see her on-screen I keep expecting the next scene to be set in MacLaren’s Pub:

But Peter Suderman notes something that’s got me anxious: The Avengers doesn’t have a rating or a run time yet, which means with a May 4 opening date, it’s not actually done (by contrast, The Dark Knight Rises, which isn’t out until late July, has its PG-13). Do we think there’s last-minute studio agita at work here?