In the same vain, any poorly-written application on any device that doesn't conform to UI standards and guidelines will drag down the experience when using that device. This isn't a problem unique to Android, but it's more obvious when apps violate it due to how multitasking is built into the OS from the ground-up.
As for poorly-written apps dragging down the experience, I don't think that's necessarily a given. Obviously if you have a crappy app, then using that app sucks, but that crappy app shouldn't also make the experience of using other apps crappy.
Don't you think this is a silly argument to use against Android's back button when the post we are commenting on is a complaint about iOS's home button? By your logic, that should indicate that the home button's behavior is not intuitive and complicated... you know, because somebody complained about it.
Obviously some people disagree with the iPhone's home button behavior. Then again, they're not complaining that it's too complicated to understand, merely that it's not the ideal (or perhaps "correct") behavior.