As an adaptation, Gnomeo & Juliet is a little loose with the original, though it does hit the major points of the play up to when the movie says it’s deviating.
While a lot of anime usually stays within the communities that already consume that type of media, sometimes something comes along that brings new blood into the fold.
And with Buffy's new found enthusiasm for being a Slayer comes new found motivation for Giles, who spent all of last season as something of a hanger-on.