How is the setting important to the play Romeo and Juliet?

The setting to Romeo and Juliet is important because it tells you where they are and its easier to follow along to what they do and where they do it.

Or, on the other hand, the setting is not important at all, as the Romeo+Juliet movie demonstrates. You can set this play anywhere you like and it will still make sense.

Please note that Shakespeare gives the physical setting (the city of Verona), but not the temporal one. Nothing in the play indicates what century it is supposed to take place in.