Can't be true. As one of the characteristics of a police state is curbing "freedom" of the press. During Bush's reign, there could not have been more Internet Websites and blogs that could have been more critical of him, not to mention the Press. Bush became the American people's excuse for not taking responsibility for their political participation. Much easier to blame everything on Bush.
Besides which, the political system just won't allow a President to have such a lot of power, i.e. to create a Politce State. Bush was given a role to play, and he did the best he could with the hand that got dealt to him. He did not do diplomacy well, but he did most of everything well, he never hesitated.
Patriot Act? Searches and seizers without warrants? Arrests without charge or speedy trial? An open distain for the Constitution (which our current president shares to an extent)? Violations of the Geneva Convention (by not calling POWs POWs)? Need I go on? It was quite close even if it stopped short. We were saved by 1 simple fact, President Bush didn't actually want to be a dictator, the peaces just fell in that direction. If we had someone doing what he did on purpose...