I 've just been through the process with a lawyer, spent around 10K usd.
My profile: 9000h tt, 3000h pic on 737 and 320, 17 years in the industry.
4 ATPLs (including the FAA one). Worldwide experience, ETOPS, Cat C airports, high altitude airports,...
Letters of recommendation from test pilots, directors of flight ops, chief pilots, instructors/examiners, even a board member of a reputed airline. I'm also a member of a reputed association. I have a bachelor's degree (not aviation related though). I thought I had a pretty good shot.
Answer from the USCIS: they sent me an RFE (request for further evidence). Basically not a no yet, but they said that I failed to demonstrate that I am exceptional, and that a pilot shortage is not enough to grant me the EB2 NIW because it's not the purpose of this visa. They want more evidence that giving me a work visa will benefit the US. They want evidence of contributions that I made to the industry. I cannot give them more than what I already gave them, so I'm giving up. I've got a pretty good job back home now anyway.
It might have been different had I been an instructor/examiner, or maybe I was just unlucky to be evaluated by a picky person...
But it's definitely not as easy as some people would like us to believe.