I think men's argyle sweaters look awesome, especially when they're made with a dark colored background and brighter colors for the argyle pattern.
I definitely have a weakness for a man in an argyle sweater! Especially paired with nice pants and some horn-rimmed glasses. I think it makes them look smart and studious somehow.
I hope these sweaters never go out of style, and somehow I doubt they will. It seems like the argyle sweater has been going strong since the 17th century with no signs of stopping.