I prefer to pick and choose from articles, since some ideas I find interesting and others poorly supported.
There's a long history of there being a "value factor", as something you need to explain the risk-reward of the stock market. There's the Fama-French 3 factor model (stock market, value, small cap) and all following models that include value as a factor. It can be measured with price/earnings or price/book or even CAPE 10. Larry Swedroe shows examples of it both in the U.S. and international, both before the factor was discovered and afterwards. Showing a factor has ... "value" after it's discovered is especially important.
So the idea of selecting 25% of countries based on value criteria is interesting. Unfortunately I don't trust Meb Faber, having read his book with the byline "survey of the world's top investment strategies". He replaced top investor Warren Buffet with the S&P 500, even though Buffet is famous because he beat the S&P 500. Larry Swedroe, famous for advocating a small/value tilt, gets represented (in an appendix) by a portfolio with no small/value stocks. And so on... everyone gets represented by something they are not, which then lets Meb Faber arrived at his conclusion that these strategies don't matter. So I have a problem with any data source from that author.
This article really doesn't defend it's use of dividends. It says dividends help avoid Japan... but why are dividends used to do that?
I would be interested in the undervalued countries approach. Right now most country-specific ETFs have two significant risks: they have high expense ratios, which need to be overcome with even higher returns. And they don't contain many stocks. Taking an example from earlier in this thread, the 3 Russia ETFs I found each had less than 30 stocks.
Maybe we should pitch this idea of undervalued countries in AQR's direction to see if they publish something about it?