There have been some problems, but seriously, believing "472%" reflects on the believers logic-and-math more than on Android.
First off, it's from a anti-virus firm, and yet competing firm
McAfee claims only 37% in the last quarter. And most reports acknowledge that most malware is from warez/pirate sites, not the marketplaces.
The first Android 1.0 phone, the HTC Dream (TMobile G1) was released end of October 2008. For those of you who worry about the 472%, that means three years one month ago there were zero Android phones or tablets.
37 months later, the last quarter (July-Sept 2011) saw 60,490 Android phones purchased in the U.S. (i.e. over
two thousand a day) , and
over 200 million activated Android devices. Both are a huge increase over 0. Or even 1 or 20.
37 months ago, there were zero apps. Today there are approximately 300,000.
472% every 16 month period, assuming a start of one malware as the first app (cuz otherwise you get infinity) only gives you a few under 125 anyhow. (Since they don't report the count, that's as good a number as any.) And the marketplaces are constantly scrubbed for those.
Stay on
any reputable marketplace and you'll be fairly safe. You wouldn't download a shady copy of MS Office from a Warez, why do the same thing with your Android device?