Very interesting, because I feel exactly this way about iOS. Typing on my iPhone 4S and my iPad 3rd gen has been a real sore spot, with lots of missed keys and unregistered taps.
Ironically, I also get that when trying to launch apps sometimes with my iPad 3. It'll gray out the icon, but it won't actually launch.
The touch sensitivity is definitely different between both. I think after some time, you'll get used to it, especially with the screen size difference. You're navigating a much larger space with the keyboard now, both in height and width.
Agreed. Thanks!