Is my Wedding Stories game pack worth it just for the world?

Yes, I think the world is worth the price of the gamepack. If you are unsure wait for a sale. I play rotational style and have 2 families living in Tartosa. I haven't experienced any bugs or lag with the world itself.

For what it's worth I also have had several weddings and the bug fixes seemed to have worked most of the earlier issues out surrounding wedding gameplay. The only thing I continue to experience issues with is the bouquet/bouquet toss.