Great acting, very good cinematography and we all know that Scorsese is a amazing director, but the movie is very long, and feels very long, a lot of great movies are very long and they are great, like Lawrence of Arabia and Schindler's List for example, they are classics and in my opinion The Irishman is not going to enter in this category.
Also the de-aging CGI is not convincing, and why putting those contact lens in De Niro eyes, when Scorsese made The Aviator he didn't put contact lens on Dicaprio, in Casino, De Niro didn't look anything like the character he was playing, it was unnecessary, probably Netflix fault.
The most positive point of the film was Joe Pesci performance, he is very contained but can also show that he is a very dangerous person, very different than the roles he played in others Scorsese's films, which are also great, and some other movies he starred during his career.
Looks like we never going to have a great movie with De Niro and Pacino playing two real old guys with a lot of screen time together, and i'm not saying that a lot of screen time together is necessarily better, for example in Righteous Kill they also have a lot screen time, but that movie was bad, in Heat they have only one scene together, two if you counting their confront in the end, but that famous scene in Heat was extremely well written, acted and with perfect timing, but this is for another review.