[quantgenius]

It's extremely rare to get a nib that isn't tuned pretty much perfectly if you buy a brand new pen made by one of the Japanese big 3, Pilot, Platinum and Sailor from an actual fountain pen retailer (online or brick and mortar). I've never gotten a remotely bad nib from any of those nor have I heard of someone getting a remotely bad nib from one of them.

If you buy from eBay or used elsewhere or for that matter Amazon, you do sometimes get a bad nib because someone has tried to tune one of these nibs and botched it and then decided to try and sell the pen new.

[dwringer]

A lot of times, with Pilots especially, if they're sold for the Japanese domestic market the tines are extremely tight and the pens write very dry, to the point of needing adjustment for writing in roman-derived script. I have a few nice Pilots and of the high end ones bought from Japan, a little bit of skipping or dryness was common out of the box.

[nunuvit]

Most nib complaints can probably be resolved with proper adjustment and maintenance. If people were doing that, I'd expect the complaints to be more focused on how the nibs defy their efforts, as opposed to how the nibs write poorly.