LOL look up your facts next time, buddy:
Might be a single-core processor, but its 1.5ghz, which is hypothetically faster than a 1ghz dual-core. Secondly, 2.3 isn't last years OS. It's this years OS for mobile phones, and will get an upgrade ~a month with 3.1 Honeycomb. They did this so it wouldn't provide a lackluster experience for the user.
Thirdly, the pen does not always create a screenshot of the screen when writing, but only when needed. IE: In Notes/Evernote or Books it actually interacts with the app. When in browser or anything else, it'll take a screenshot when writing. HOWEVER you DONT have to use your finger to navigate, as the back of the pen is capacitive, which interacts with the screen.