My dad and I watched Munich on DVD tonight. I loved it, and my dad seemed to really like it, too. But, after going back and looking at the reviews -- which were mixed -- I can see why a lot of people didn't.
The general theme of the movie is terrorism and the reaction to it -- in this case, the 1972 assassination of the Israeli Olympic team by Palestinian terrorists, and the Israeli response thereto. (For those who haven't seen it yet, I'll try not to get too specific.) Ultimately, the movie presents the conundrum of how to react to violence -- whether more violence is necessary or right, and whether it even works.
I'm not sure I agree with Spielberg's conclusion, but I have to respect him for making a serious movie that will make everyone think about the dilemma.