Obama has used teleprompters far more often than any other president, including Bush, even for things like photo ops. It's a legitimate line of criticism.
An utterly empty criticism, you mean. The key isn't whether a president can deliver a speech off the cuff, but whether he can WRITE one worthg damn, which President Obama clearly can.
W. and most GOP hopefulls can't begin to write a birthday greeting without multiple speechwriters. Gigrich and, to a lesser degree, Santorum could, but the end result is inevitably two parts crazy to one part fail.