Yes this must be a low point for Mr Pacino.
It's a sad tale of a man who's given up and is obsessed by an old partner who returns his many letters that he writes to her. He has an argument with his son, and a failed date with a bank clerk, but neither scenes are allowed to develop or resolve, so the whole film drags on slowly and lacks any achievement or humour. You end up feeling just as hopeless and bored with life as Manglehorn himself.
The end of the film comes as a surprise as you've waited so long for something to happen - and it doesn't.
Not one of Al's best. Dreary bloke doing dreary stuff. Kitchen sink meets big brother. If the main man decided to have a wash and shave may help.
I totally agree with the review by RD. I must have chosen this film because of Al Pacino and Holly Hunter and kept watching assuming that their stories would be developed. Pacino plays an likeable character and Holly Hunter is not given the chance to display what a fine actress she is. The movie tries to be important but it is not.