My feelings for FJM were well-documented in last year’s Arcade Fire thread, and I don’t want to derail another one on his account, so I’ll keep it short:
I find him to be an incredibly average songwriter and very unfunny for someone who’s supposed to be a great wit. Think it would have been best for everyone if he just stayed as Fleet Foxes’ drummer and backing vocalist because, as you said, he has a decent voice.
If I have to stand through it to see Bjork anyway I’ll try to make the most of it and give him another go, maybe it’s better live than on record. But I would have preferred Beck by about a trillion times