Taxi Driver is one of those rare mainstream horror movies, dark and sinister, ominous and threatening.  The mind of Travis Bickle is fierce and frightening, the loneliness omniprescent.  The performances are amazing in  this film, Robert DeNiro, looking very young, is incredible.  Cybil Shepard  is an odd fixture, and her role is never adequately explained.  Some may  find that annoying, but it adds a bit of thought from the viewer, which  really makes the movie interesting.  The special edition is wonderful, the  hour long documentary is inciteful and well worth having.  A real keeper,  and one that can be watched many many times, each time the viewer brings  something new.  It is incredibly violent <take a look at the stills in  the documentary of the tracking scene with the intense color> and  slightly explotative (which is understandable before Mean Streets, Scorsese  did Boxcar Bertha for Coreman) but like Silence of the Lambs, the  explotation aspect is one in keeping with the tone and feel of the movie.