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I agree with both your points--at least with respect to Guns Germs and Steel. Arguably he way overextended his basic research in later works. An interesting supplement to Diamond is Ian Morris' Why the West Rules--for Now: The Patterns of History, and What They Reveal About the Future. To greatly oversimplify, Morris endorses the idea of a Western core headstart (with credit to Diamond) but then basically says "Well,…
Fortunately, there are a couple examples of serious researchers who are also excellent (though maybe not as well known) popularizers. Daniel Kahneman (Thinking Fast and Slow) and Steven Strogatz (Sync, etc.) come immediately to mind, because I have read them recently. I have some books by Benoit Mandlebrot in shipping, and I am quite excited about them. If anyone has other examples, I would love to hear them--I'm try…
Joseph Stiglitz, Milton Friedman, Friedrich Hayek & Paul Krugman are all winners of the Nobel Memorial Prize in Economic Sciences and all have written some accessible books for the public.
The Richard Dawkins books on biology are really good.
Steven Weinberg, winner of the Nobel Prize in Physics has written some fine popular science books.