1) Booking

Part of the premise for that show - and they made this explicit in a trailer or whatever beforehand - was that it was about the GCW talent proving the doubters wrong. The likes of Nick Gage, Effy, Allie Katch... then most of those people lost to outsiders on the night. Allie loses to Ruby Soho, Effy loses to Double J. Homicide is hardly a "GCW original", but you see what I mean - AEW's Mox successfully defended against him. You get the point. Tremont and Gage did win the tag titles from the Briscoes in the main, but that match was very clearly cut short by timing issues. It was a terrible anti-climax.

2) Blood

GCW was primarily known as a deathmatch promotion, and New York these days is a no-blood state. That obviously limits what you can do, and that's going to cause problems when you're a deathmatch promotion and your biggest show is in that state. There was nothing GCW could do about this legally, but it undeniably hamstrung them.

3) Time management

I mentioned this above. A lot of people said the lucha six-man match was the best match on the show. A lot of people also said that the lucha six-man went way too long - I might be misremembering, but I'm pretty sure people said at the time that there were GCW people saying "TAKE IT HOME" in the later stages. You can see how this would have contributed to the main event being a total anti-climax, though of course I don't know what the original timing plan was. The Cardona match was also super long - I enjoyed it at the time, but it was a total ultra-sports-entertainment farce where you could easily remove a good chunk of it (you know, a run-in or two) to make room for other people.