Does the reconciliation between the Capulets and Montagues make a good ending to Romeo and Juliet, or is it an anticlimax in which no-one is...

This is a great question to consider. In a sense, the
ending of the play and the way in which it refers to the feud between the Montagues and
the Capulets ending is a fitting conclusion, because it showed that the death of Romeo
and Juliet was not entirely in vain and that something positive was gained from it.
However, on the other hand, it is possible to take a somewhat different and more
depressing view. Consider how the Prince closes the play, and in particular pay
attention to the dark imagery he uses:

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A glooming peace this morning with it
brings.

The sun for sorrow will not show his
head.

Go hence, to have more talk of these sad
things;

Some shall be pardoned, and some
punished;

For never was a story of more
woe

Than this of Juliet and her
Romeo.

The "glooming peace"
and the way in which the sun is personified as suffering from grief plunges the ending
of this play into an unremitting darkness, questioning the price that was paid for the
peace that has been achieved. The line "Some shall be pardoned, and some punished,"
likewise indicates that the punishment of Romeo and Juliet's death is something that
will continue long after the ending of the play. I wouldn't personally describe the
ending of the play as an anticlimax, but the high price of the peace that has been
achieved definitely overshadows the ending.