Is Paleo diet a good thing?

Is Paleo diet a good thing? It is a diet that is intended to resemble the diet of paleolithic man.

Arguments for

 * Human organism was finetuned for a certain diet. The adaptations, via variation and elimination, were for that diet. The changed modern diet does not match that diet adapted to. The human body may still work well enough with the modern diet, but is unlikely to work optimally. Thus, there is a potential for improved health.
 * There is some plausibility to it, but is too speculative. Direct empirical evidence of health effects is much preferable to abstract considerations like this.
 * Direct empirical evidence in nutrition science is hard to obtain; that "science" is notoriously unreliable. An abstract self-proving argument is much more credible than hard to independently verify latest theory of nutritional science.

Arguments against

 * Paleo diet's emphasis on meat consumption makes it environmentally unfriendly: it takes more resources to produce meat than equivalent non-meat diet.
 * Vegetarian (plants, eggs, milk) Paleo-like diet can be considered. It will not be completely Paleo (it will have milk), but it can reduce amount of processed food, for instance. And without milk but with eggs, it will bolster its Paleo character; eggs are 100% Paleo.