Basically exactly how I feel. Both matches had Djokovic playing well in patches. In 2007 the errors were clustered together when he was in winning positions and in 2013 they were a bit more frequent but not as clustered in pressure moments.
Really those matches are not much difference from any of the other late stage losses Djokovic has had at the USO. Aside from his winning runs his level has been very consistent since 2007. The exception is that I think his 2012 level pre semi-final was one of his very best but he didn't handle the conditions.
Why do you think he's struggled to convert in NYC?
Yes, neither 2007 and 2013 was picture perfect from Djokovic, his issue was, when he had his opponent in a vulnerable position both times, he blinked, the pressure got to him, and that is all Federer and Nadal needed to get the job done.
In regards to why he struggled to convert in NYC. A few reasons, some are specific to each year, others reasons spread out over a couple of years.
2007 - He was cocky, full of perpetual belief, aggressive bold to stand before Federer. I think he just blink at the wrong moment and Federer with his much superior big match experience made him pay for not taking that first set.
2008 - I think a bit of the wind at left his sails actually thanks first to Nadal. Djokovic was flying very high up until Rome 2008, and was poised to take that number two spot. Nadal battled Djokovic hard in Hamburg and at the end, just out willed him...I think that hurt Djokovic. It was the first time his ascendancy had been stopped from progressing. Nadal then hurt him again in RG 08, but losing to Safin at Wimbledon was the heavy blow. That match was considered a shocker, by the time he got to USO to try to pick up some momentum, Federer had found a spring in his step by winning Olympic gold, so what we got at USO 2008 was Federer back in form, Djokovic coming off the back of multiple heartbreakers. Federer overall was just better.
2009 - Djokovic imo never fully recovered after that legendary clay court trilogy with Nadal. He looked like a different player after Madrid 09 semi, the gulf between him and a inform Federer that year was too high. I was not expecting anything but a straight set win for Federer.
2010 - I think he was happy just to make the final, the complete shock on his face after he beat Federer in the semi said it all, and while he matched up well against Nadal, his form that year was the worst of his career before RG 2016 happened.
2012 - Yeah, this is a bad loss. Not in the sense that Murray won, but in the sense that Djokovic faded in the fifth quite quickly despite fighting back to level the match.
2013 - we spoke about it
2104 - I think two things influenced him...one was he was drunk on victory, winning Wimbledon, imo most important slam win of his career and getting number one back after a series of heartbreaks and two getting married. I don't think his mind was fully in it.
2016 - Poor form, injury and a joke draw. He had no business getting to the final, the moment he faced a decent opponent, he lost.