How Bad Are Singletons?

Question

So ....

There are obviously many questions that all have been asked about Singletons, Global State Variables, and all that great stuff. My question is,

Answer 1

If Singletons and Globals are So Bad, Why are they used so often?

I think the gist of it is that Singletons make things easy. At least at first sight. I don't have enough experience with the matter to say anything more useful, however I found the following a good read:

Singleton Considered Stupid (Steve Yegge)