Positives: very helpful in understanding what is going on in the world. For example, although I would apply the symbols of beast and false prophet, to specific historical individuals, I definitely believe that there is an element that we can identify current State oppressors as beasts, Hussein, Mao, Stalin, etc. I would speak the same way with respect to many of the other passages in Revelation, especially the final 2 ch. Some will simply point this as being part of the 'already-not yet' tension, but I definitely believe the 'new heavens & new earth' have broken into history with the death, buriel and resurrection of Jesus, but their fulfillment/consummation is still future. I like the idealists understanding of this passage.