Writer's Fallout Shelter

A sum up of Andromeda is essentially that there is an extraterrestrial virus that accidently got taken to earth, and a group of scientists is trying to figure out a way to neutralize it in an underground government facility. At some point the virus breaks out, and as the scientists struggle to contain the virus they find that it simply mutated into a completely harmless form anyways.

The ending was, more or less, deus ex machina. The scientists were at a loss, and the problem basically resolved itself. Now, the novel was hardly exemplery, but it certainly wasn't bad, and the ending worked for what the novel was trying to do.

Deus ex machina isn't necessarily bad, it just doesn't fit with contemporary writing styles. That isn't to say that it can't work, it just usually doesn't in what we think of as literature.