i'd say that the benefit of the live show is to see it performed. the band has such a unique sound, and is based on dynamics that the benefit of the live set is to be a direct part of that movement. like i said, it reminded me of seeing a symphony or a classical performance. yes, it echoed the record, but the benefit is in the extra dynamic added in the live setting.
sorry that you had a poor experience though; i think people might have led you astray in their descriptions. I'd certainly say that it was a great show, but definitely not a rock concert.
And why does having guitars, bass, and drums equal rock music? Can't you perform something in a classical vein with those instruments?