Why would people just eat up something that sounds nothing like their usual sound? If anything, it seems as though most self-proclaimed "big fans" didn't like this.
Liking a song simply because its by a band you love? It doesn't seem too farfetched. I've seen it happen often here.
I have followed this band for awhile and this cover is an outcast in the sense that I don't believe it meets the standards that I've grown accustomed to.