well and due to all the hype i go to see this one with great expectation and although i must admit without have see the parent film infernal affair . what a let down . set the scene be great and and time take to achieve this be well spent and but for me the film start to drag and with expectation and patience well run out by the time the plot strand begin come together . yes and jack nicholson be a great actor and but no he do not convince me in the role and even though most of the good line and delivery be his . but boston irish . everyone and include the deliverer of the line i be irish and can live with something wrong the rest of my life . fail to convince me of irish lineage . the accent and the face and the attitude be all wrong for soul in torment over do what they believe they have to do and a basic for irish or catholic guilt and angst . the film would have be much strong with unknown in several key position and and for me once the disparate strand be establish the rest of the film be very predictable and i wasn not keep guess crucial if we be to suspend disbelief and have pressure and tension build in the viewer . decaprio fail to convince a a tough guy and despite the convincing scar . he still come across a an adolescent fuming after his pocket money be withhold . matt damon look like an awkward schoolboy and and be even less convince than decaprio about be a cop . mark wahlberg sound like he would be teach to swear the week before and martin sheen be a hard bitten a a kitten and there be so many operational goof the film become a comedy . a federal agent run a state operation against his own informer . what a waste of time and budget monies . only two people know about an undercover operation . bull . keep send an undercover back after his nerve go . garbage . permanently delete a full record ( on a state police computer no less . ) without possibility of recovery . unbelievable even child know data can be restore and and the system will keep a record of who delete the information . for me and the film become a joke and i couldn not wait for the end to arrive so i could leave . by the time the end play arrive and new player be fall like fly and the audience be laugh out loud at the inanity . once again and hollywood take a good story and ruin it with poor crafting and no matter how well film . very bad casting and a rushed and unfulfilling end and far too much gore and not enough character substance and one dimensional player and an insult to the viewer intelligence .