Maybe I got lucky with my audience (even though I went to my local AMC, not really known for respectful audiences usually), but everyone was fully engrossed in the matinee I went to. Didn’t find the accents that tough to understand, and I really dug the theatricality of the monologues, which granted is something I enjoy when done well.
You definitely have to buy into it very quickly, or you’ll likely roll your eyes a lot, between the salt-drenched gruffness of the two leads (who are both great, what a year for Pattinson) and some of the magical realism aspects.

------------------------------
For the record, my teams:
MLB: Mets / Soccer: PSG
NCAA BB: Arizona / NCAA FB: Michigan
NBA: Spurs / NFL: Jets