Sorry, but it's really hard to understand what you're trying to describe.
1. Which app is useless?
2. Are you judging Android based on your experience with one phone (your Z3) or multiple ones? Perhaps you had a bad unit. I have a Nexus 5, and it's been flawless.
3. Are you actually upset that things on the phone are constantly updated? Most people appreciate the fact that apps or systems are updated, because that means the developers are paying attention to complaints, and are constantly trying to improve things.
4. If battery is an issue, what have you tried to improve it? There are various causes for fast battery drain.
I realize that this is probably a lost cause, and I hope you're happy with the iPhone, but I figured I'd just ask.