Here's how I see it:
$400 mill - Not a figure Marvel will be especially thrilled at, but can live with it.
$450 mill - A good result. That sequel we just greenlit is more than justified.
$500 mill - A resounding success, absurd interpretations of the word "smash" notwithstanding.
$550 mill - Marvel magic! We did it again.
$600 mill and up - Amazing. We're so good we could make a financially viable Squirrel Girl franchise.
Summed u nicely.