What is Romeo and Juliet about?

(Frederic Leighton)

One of the constant themes in Romeo and Juliet is that of teen angst.  This, perhaps just as much as the romance in the play, is a feeling to which readers of any era are able to relate.  On more than one occasion (and with a variety of levels of snark), I've heard this play described as being about teen rebellion more so than love.  This argument may hold some truth.  From Juliet describing her situation as "past hope, past care, past help" (4.1. 46), to Romeo unleashing an anti capitalist tirade on an innocent apothecary (5.2. 84-91), the text is certainly ripe with teen angst and knowitallness.  But does this attitude take away from the love story built around it?  Which aspect of the text has led to its constant retelling and re-imagining?