This is not the easiest question to answer considering that videogames aren’t exactly like movies which usually last between 90-180 minutes. It is difficult to compare say linear games which usually last 10-12 hours to open world games that can last from 15 to upwards of 40 hours. And obviously you can’t compare something like Tetris to something like God of War.
Still i asked this question after recently revisiting Dark Souls 1. Dark Souls 1 had an incredible beginning and it keeps rising in quality until you reach Anor Londo where I feel that the game reaches its peak quality wise. It is genuinely phenomenal at that point but after you complete Anor Londo, the quality of the game does drastically goes down with the exception of the DLC and few optional areas/ bosses. That doesn’t mean that Dark Souls 1 isn’t a great game, it just has a disappointing final act that isn’t able to compare to its best moments.