Had a 3GS, it was a bitch of a phone. No customization other than what Apple let you do.
The apps, while a good selling point, I find pointless. The amount of crap you need to sift through to find a good app... How many truly successful, fun, useful etc. apps are out there? A handful. There are millions of other shit apps no-one cares about.
Only the successful ones migrate to Android because they were successful on another O.S. I'd rather have a majority of tried and tested good apps in the Android Market than piles of shit ones.
Though, I choose to stay unbiased. I got my little Galaxy Ace because the iPhone 4 was way too much for what I use my phone for.
The iPhone 5 release looks mundane to me. Longer screen, 720p internal camera and updated A6 chipset... Whoop-tee-doo. Same OS (though updated), same screen resolution etc., same apps, same functionality - now with an extra row of icons, better selfies and slightly faster!!! Wow.
Aesthetics aside - wtf. In my eyes, and in many others', this is nowhere as big as Apple hype it up to be.
Plus - New charger? Why? Lets just make almost every accessory available with a dock obsolete unless you spend MORE money on an ugly adapter. I know this is a very smart business move, but that doesn't change the fact that it's a dick move.
Bigger screen = yay! Black bars!