First of all I would like the name of the app your girlfriend downloaded and was it even from the Google Play Store? If not then you can't blame Android. If yes, report it. Apps with viruses have shown up on both Android and iOS, people who make viruses target OSes that are the most popular.
If Windows Phone gets some attention in the world, yes you will see apps with viruses on it too. But if you have common sense you'll not run into apps with malware.
The versatility of Android is that it can be as simple or as complicated as you want it to be, if you don't understand how to use a smartphone just pin a few apps on the homescreen and be done with it.
If a firmware update messed up her phone, wouldn't everyone with a S5 be complaining about it? Firmware update had nothing to do with this.
Android has had Data Sense and Storage Sense almost two years before Windows Phone and everyone would agree that the settings app is best arranged on Android, not Windows Phone.
The Data Sense and Storage Sense are right there when you open up the settings app, how was it so hard for you to find it?
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I've also repeatedly explained that not having apps is just half the problem on Windows Phone, even the apps that you guys do have lag behind Android and iOS. For example if you compare graphics in games like Asphalt 8 between Android and Windows Phone, you'll think the Windows Phone version is a PS2 game.
I hope I've cleared up all your misconceptions about Android.
Haha that's the thing you don't understand, I learn something new about Android everyday and even after having used it for over 2 years it's not boring, especially due to the customization.
Plus Windows Phone has looked pretty much the same since 2010, if people haven't got tired of that how would you get tired of Android?