I don't suggest you buy this album! I don't think you'll like it!
But, that doesn't mean that it isn't a good and at sometimes great album.
I like Modest Mouse and have for the last 4 or 5 years. I like the sound of Issac Brock's voice, but I don't think you will. There are some tracks from his last album that sound like other indie songs. Most people would probobly have no problem listening to Float On and the Ocean Breathes Salty, but other tracks would turn you off. Issac Brock is pissed and it really comes through in his music. This new album has it's up tempoed songs (March Into The Sea/Dashboard/We've Got Everything), but it's still Brock's band, and he goes off from time to time.
Basically, I would say you might want to check out some of the songs mentioned above, before you try an entire album. Dashboard is my favorite song from the new album and will give you a good idea of the bands range.
I should mention that I told Matt that James Mercer (The Shins) appeared on this album. That is true but his vocals can only be heard on We've Got Everything.