Nothing you've described are native android problems, wifi ALWAYS reconnects for me (and always has on every 2.1 and 2.2 rom I've used, vanilla or custom).
As for the touch screen, either you've got 2 faulty handsets or you've got fingers like richmond sausages and you're just mashing away on the screen.
Or, alternatively, they are documented problems as has already been suggested (and also obvious when google searching).
I have no problems using my iPhone 3G, iPhone 4, Xperia X1, or Blackberry Storm with my fingers, so I highly doubt its me.