It should come as no surprise that Android gets hammered for being open to criminal intent due to some of the challenges (and opportunities for dubious activities) this OS presents (the latest of which being a virus that will record any given end-user’s phone calls) on a smartphone that has been compromised.
Granted, the onus for ensuring that your phone is free of viruses, etc. rests with said owner. However, as the trickery of these programs become increasingly insidious it is a strong reminder of the merits of the walled-garden approach (which is also not above reproach).
In sum; be it an open and/or a closed environment, technology is only as good as the people that create (or, unfortunately, exploit) it.
From the UK Register: http://goo.gl/HDiqO