Its usually somewhere around the 3rd and 4th film where film franchises flop and lose their true essence. Batman is getting a new start although I don't think "a new start" is an option for the Terminator franchise when given all the circumstances.
I am 100% confident that Batman Begins will be an excellent film. I actually got the chance to visit some of the streets Batman Begins was filmed on during its actual filming. It was filmed throughout downtown Chicago and nearly every single building looks like the Batman comics come to life.
I only hope that both the trailer and film sets for T4 will as amazing as this when the time comes.