Pangur Bán
Deconstructed
I don't imagine any would disagree with that, they're just sceptical that you can weave a world history from it. Looking at the mechanics of diseases can tell us why epidemics had such a catastrophic effect in the New World which they generally didn't in the Old World, but it doesn't tell us why that's significant, or why it had the outcomes it did, for the numerous reasons already outlined in this thread.
Bits. Mostly I'm commenting on the debate (here and more generally); I'm not really invested in this one way or the other. (Mostly, I'm split between a sympathy for his attempt to make popular audiences care about structural aspects of history, rather than the high dramas and boomsticks which seem to make up 90% of the market, and a concern that his way of going about it is part of a larger movement towards apology for European empire, just with a pessimistic inflection.)
The description of it given by Lord Baal et al earlier in this thread is not accurate. Diamond is not an apologist for European Empires or any advocate of European superiority. He was accused of the opposite in fact by many in the US for saying stuff like New Guineans are generally smarter than Westerners, and so forth. GGS just raises the profile of geographic/biological factors in shaping the course of world history; he absolutely does not seek to supplant the sort of micro-politics/events driven history done by documentary / political historians (he says so explicitly, but wasted his time as people are more interest in attacking a straw man than dealing with what he actually says).
Anyway, the Rise and Fall of the Third Chimpanzee is a much better book. Read that before you read GGS. It is undoutedly true that Diamond has consented to the depiction of himself as a great thinker undermining traditional narratives of world history, but he is actually quite conservative. Read the books or don't, but don't rely on PR spin or straw man-looking criticism.