Other phones being "better" as you say... is just your opinion. Nothing else comes close to iOS.. and no other phone is built close to the iPhone 4.
And this is where you try to pass off your opinion as fact. The finality with which you make those statements and the way you brush off anything else as garbage shows that you've completely bought into the Apple hype machine.
The iPhone 4 is a great product. And the older generation iPhones, despite the plastic back, were great products too. In fact, I've thought about buying an iPhone 4 on many occasions, but haven't been able to give up a physical keyboard. But, yes, the iPhone 4 is a great product. That's a fact, despite the vulnerability of that glass panels on either side.
But no other phone is built close to the iPhone 4? Eh, not so much. Motorola builds a fine product, and my experience with my original Droid is comparable to all of my friends that have owned a Motorola smartphone. (And I would guess it's similar to those who own HTC products.) Drop a Droid without a case from waist level, and you'll knick up the metal band, but that's about it. Drop it 20 more times like that, and it's still fine. Drop an iPhone 4 from waist level and you're damn lucky if that doesn't break. And sure, it's cheap to replace the back, but what about the front? You're basically buying another phone there.
You talk up iPhone and iOS like there's no competition and it would be stupid to buy anything else. But, while the iPhone is a great product and iOS is a great operating system, that's just not true.