There are two parts to this. When they say up to 36" and you get 6 that is ridiculous. When they see that the path has shifted and refuse to update their forecasts for no apparent reason, then they deserve to be mocked. By all means predict towards the dire side so people take you seriously, but as it gets closer to the storm and you have updated info, you need to revise predictions.
Not only that but nearly the entire city was shut down even though there was very little snow at the time. Most businesses were basically forced to close several hours early even though there was no need.
Of course, when you consider how many workers in Manhattan had to commute home to places that DID get 15, 20, 28 inches of snow, I'd say that was not such a bad call after all.
The unique geography here has people being kinda myopic about the forecasts.
1. This is the ONLY coastal region in the nation with the specific weather associated with being a coast that takes a hard right turn AT our location. Because of that, and the temp. nuetralizing effect of the water, usually that means a matter of miles West / Inland is the difference between rain/snow and huge totals. In addition, the tip of Long Island is not only a coast to the south, but somewhat sticking out into the Atlantic to be an ecosystem all it's own sometimes.
Finally, you have NYC at the armpit of the curve, in the bullseye between being to far east or two far west depending on the storm - or right in the bullseye when precip and temp work together.
2. NYC itself is MILLIONS of people - and most of them are concentrated in Manhattan during the daytime. Those people who get 12 more inches of snow to the west and the people that this time got 20+ more inches to the east.
Where else in the nation are that many more millions of people in one area a few miles wide in a region that spans legit 50 miles each way in terms of commuting? Weather systems here are very unpredictable because of the water and East and then South facing shores, and the spot that is RIGHT in the middle of the water vs. land, hot vs. cold, will the ocean fuel a storm or pull it out to see - well that spot's freakin' manhattan.
In Denver or KC or, Chicago even, you generally have a far better idea of whats happening without either variables to the drastic change over the course of 20 miles east or west (Chi has the lack effect, but nothing like these variations as I understand, and far more predictable)