Huge fan, but his post-Office films are disappointing...
His films before and during the Office were overall well done comedies that added to his fame. His films since leaving The Office are more serious and lower quality flicks (Crazy, Stupid Love and Seeking a Friend for the End of the World), which make me wonder why he left The Office and is resisting a re-appearance.
I think he, like Jim Carrey, should stick to comedy with characters that are mainly funny and a little sad/pathetic. When the whole film becomes him portraying a character that is mainly sad/pathetic and a little funny it doesn't work.
I hope he can turn it around with his next film Burt Wonderstone, but I think he is also doing another 'serious' film playing a psychotic/murderer.