I watched the whole thing and do not share your reaction. In the last half of the debate, IMHO, Bush had the "doesn't anyone have a fly swatter?" look. To me, Kerry looked like a petty and annoying pest. Too bad Reagan already used the "there you go again" line.
Don't bring up the Reagan-Carter debate. Because the last time I say an incumbent look as frustrated and angry as Bush did tonight was when Jimmy Carter debated Reagan. And Reagan won.