Often, an initially promising solution ends up falling short upon closer examination of the details. Naturalists encounter such a scenario when trying to use the multiverse to get around the cosmological and design implications revealed by scientific discoveries over the past century. At one time, simpler multiverse models appeared to produce a sufficient variety of universes that might explain the obvious fine-tuning of this universe without appealing to a divine Creator. However, more detailed and realistic models may dash those hopes. Read more about one problem encountered by multiverse advocates in this previous TNRTB.
P.S. The Get Fuzzy comic strip in the original article is from December 23, 2007.
If you would like to see a question about the multiverse addressed in this forum, send it to firstname.lastname@example.org.