I just bought the DVD "The Departed", am I going to be dissapointed or not?

I've heard great things about this movie and I really want to watch it, so I got the DVD, but I wantd to know what others thought of it. I love Leonardo Dicaprio and I have enjoyed the other Scorsese films he's done. Gangs of New York and The Aviator and Shutter Island, so does The Departed beat these films or is it a dissapointment. Thanks XD