It can be, depends a lot on how steep it is and if the flippers are good. Weak center ramp shots can often go back straight down the middle. If you get the ramps down, though, you can just spend all day hitting the center ramp, or go up the left ramp to advance the story (that said, I can never get the billions without cheating, and my machine has had some weird issues for a while, going to try a new cpu board and hope)
Pinbot isn't exactly easy either.