There's a fascinating piece here about how outsourcing doesn't always work.

I haven't experienced this directly (I'm usually the person brought in on outsource, rather than outsourcing work myself), but it does highlight what is probably an ongoing problem in the outsourcing workspace.

I've spoken before about clearing up after other people's messes, and my wife has in the past experienced issues with some outsourced companies, so I have second-hand (but a very good one) experience of the problems faced.