I just don't see why!? Sure, I can appreciate the artistic sensibility of their work. They are definitely doing something with samples and being a "concept band" that no one else that I know of is doing. I just don't like music where the vocal track is just incidental to the rest of the music, its just one of the pieces accompanying the music.
I'm a very verbal person. I like to talk and chatter on and on endlessly, probably to a fault. Likewise, I like that in my music. I like interesting lyrics, which i'm sure animal collective has, but I like to be able to hear them clearly. In fact, if there is anything that I think draws my musical taste together it is a focus on vocalizations and lyricism. I dislike Radiohead for this reason, but tolerate them more because on some tracks I can definitely hear their amazing lyricism. Also, I feel for some reason my music collection wouldn't be complete without some Radiohead in it. Weird I know.
So in conclusion, Jandek yes! Animal Collective no!