It used to be 'for choosing IBM'. Over time, that became 'Microsoft'. Arguably, now it's 'Sharepoint'. It certainly seems that way to me. A huge percentage of large corporations have chosen it for the portals / intranets, yet I don't hear much enthusiasm for the product. The best that commentators seem to be able to come up with is things like, "It's very flexible - if you've got the development staff to tailor it", or "We know the supplier's going to be there in five years". In other words, weak praise, mainly driven by safety concerns. Maybe the recent purchase of Yammer will change things, but it's too early to say.
In the meantime, there are some excellent out-of-the-box and/or SaaS social intranets that are virtually unknown by comparison: Interact, Igloosoftware, Thoughtfarmer, MangoApps, to name but a few that I've looked into or used recently.
Maybe it's time people did start getting fired for choosing Sharepoint instead of properly investigating alternatives such as these?