I'm a mobile QA, and I sympathise with them to some extent. Unlike iOS, there are thousands of devices and configurations that their software needs to be tested on for Android, and things like screen size/resolution and little add-ons from the manufacturers can make things extremely difficult especially with UI issues. Quite often, it's not even the QA team's fault - a lot of the UI issues that I find can't be fixed due to difficult deadlines, yet customers will always blame QA in app reviews etc. Mobile technology is moving so fast that I'd imagine there's a lot of pressure to deliver, and this could affect things to some degree.