If you've heard the plot summary, this movie has no surprises. In that regard, I found it basically pretty bleak from start to finish and regularly upsetting.
Things that might recommend it?
Rinko Kikuchi is predictably fantastic (... albeit at playing a sad, isolated individual).
When it's funny, it's often in a charming and real-feeling way, such as when a hopeless Minnesotan cop takes Kumiko to a Chinese restaurant in the hopes someone there can overcome the language barrier between them.
It often looks and sounds great (feel those VHS artifacts!).
But not sure I'd rush to recommend it to anyone.
Heaps of fun, packed with the kind of bathos you'd hope for from the combo of Taika and Jemaine in charge. Lots of jokes have an added layer of laughs for locals, but would stand up anyway - e.g. that the vampires like to go and hang out at a bar called "The Big Kumara" probably seems pretty hilarious whether or not you know it's a real place.
One of those highly-rated movies that is just bloody awesome (mate). On a big screen anyway... nothing happens in a rush, the cinematography's great (so much interplay between massive shots and claustrophobic close-ups), the soundtrack is Morricone's best, the story's good enough, the dialogue's fun, all the main characters are interesting... Absolutely top notch.