If is 2x as fast and has 9x's graphics then who cares if 256mb, 512mb, or 1GB makes it run? I'd say 17 million tablets later that Apple knows what it's doing. I guess some people won't be happy no matter what Apple does. Go buy a Xoom then and quit the crying here.
Ummm, because "up to twice as fast" does not mean that your Safari tabs won't require page reloads every time you switch between them? "Up to twice as fast" doesn't mean your memory-heavy apps won't crash randomly. "Up to twice as fast" doesn't even guarantee that things won't slow down during prolonged use of multiple apps.