Haven't heard the new Bon Iver, it's on my list, but Wilco's The Whole Love is just a fabulous album. It didn't do much for me right away, but after a few listens, I was convinced. I actually liked the last couple of albums, but this one is miles better.
I still think that Let England Shake is a great album. It's coming out on top of a bunch of year-end lists; it would get my vote for "least overrated" album of the year. My vote for most underrated is The Strokes, Angles. It seems like it was a disappointment for a lot of people, but I think it's got a great '70s feel.