Doing the math or judging distance isn't the problem with Putting here !
It's the left & right breaks that are a crap shoot, or should I say a crap shot ! at least for myself.
Since there is no way to judge them except to roll the dice and hope for the best, because the dots on like speed & distance will break differently, even if your replaying the same hole within minutes, its all luck & programming.
its good in that it is luck like real golf, but the speed of the break they depict are not consistent which makes it very frustrating at times. the skill comes with hitting the right percentage on meter and then luck if the program lets you make it.
This is my opinion only.