Is it? As Brwned said, the Crazy 8 thing was silly, then you've the bath tub, the plane crash, the magnets, Gus, the twins etc etc.
Breaking Bad has always been about creating the ultimate TV drama full of suspense, action and emotion but in order to achieve those things there's always been a need to suspend some form of belief with it, the finale was no different.
I'm not sure why people are underwhelmed by the finale itself or feel that it was too predictable. What did you want them to do exactly? Not kill the Nazi's? Not kill Lydia? Not have closure between Walt and Skylar? Not have Jesse kill Todd? Not have Walt die? A few days ago these are exactly the things that everyone wanted to happen yet somehow now that they have, everyone is suddenly disappointed that they did.