Many bloggers try to make comparisons between current events and the "fall" of Rome, in order to make dramatic statements about the future of the country/world/etc. This would be a good book to recommend to such bloggers, as it basically dismantles the idea of a definitive "fall" of Rome. The history is a little dated, compared to Heather's more recent book), but essentially communicates the same concept. And it is relatively short.
The topic is obviously interesting enough but rather than an objective perspective the author simply takes up his pro-Christian partiality against the anti-Christian perspective of most of the other scholars of Rome's fall -- and not very effectively or convincingly at that!