Ooh, I can't wait to get home and download this!
I only own Friend Opportunity, but I like it a lot. I agree that Satomi's voice is being used as more of an instrument/accompaniment, and while my music tastes are usually lyrics-oriented, in this case I can get into the music without decipherable or sensical lyrics. It's challenging music, definitely, but somewhere around the third listen it clicked and I was like "this is pretty sweet!" But then, I like Plastic Ono Band too, so maybe I just have a higher tolerance for difficult Japanese singers. I should get more Deerhoof records.
I also think that "trying too hard" is just a phrase used by people who didn't think of doing it first.