Taxi Driver is what I believe to be Scorsese's masterpiece and his most artistic and emotional film.  This movie is just a culmination of Scorsese, Schrader and DeNiro beautifully portraying material that they all identify with on a personal level.  The direction is flawless, the script is fantastic and Robert DeNiro's performance as Travis Bickle may be his finest ever, and definetely deserved the Best Actor oscar for that year.  This is filmmaking at it's absolute best, and even though it came out of an era with countless classics, Scorsese's Taxi Driver still stands out as one of the most breathtaking peices of cinema ever created.