The Departed's love triangle could have been explored a lot more. The way it is, it's treated far too redundantly, though it does offer a chance for emotional complexity in the characters, which I'm always up for - especially when they're played by two good actors in DiCaprio and Damon.
Regarding Damon as the tragic protagonist or slime-ball villain: isn't that just ambiguity, or good writing?
...dot com bold typeface rhetoric. You go clickety click and get your head split. 'The hell you look like on a message board Discussing whether or not the Brother is hardcore?