The Siege realistically portrays what the government is capable of under such extreme circumstances. Enveloped in a collective paranoid terror, citizens of New York City crouch and drop to the ground at the sound of a bus backfiring. The government responds by declaring martial law and breaking regulations: First, the US Army cannot be used against the American people, and second, the government cannot legally invade the privacy of its citizens. Although this movie was before the Patriot Act, which allows law enforcement agencies to gather information from emails and cell phones, the extent to which the Army goes in The Siege is far beyond the tenets of the Patriot Act.
Anyway, it is a great movie, and I cannot see why someone would find this movie racist. The Arab citizens are portrayed as normal people just like everybody else, and just because a movie contains a scene in which Arabs are sent to internment camps (en masse) does not mean that the creater of the film believes that this is correct.
As for the acting, every role was played superbly, although Elise was not very convincing...
And, in response to the person who said that they never really said why the terrorist cells were attacking, here is the answer, which anyone who is really paying attention should be able to grasp:
The U.S. secretly kidnaps a Muslim religious leader, which sparks terrorist attacks on the city of New York.