Alex Jones is an acquired taste to those who like movies like this, and an easy target for those who don't.
A lot of reviews of this film tend to focus on stereotypes not present within this actual film and base it off 'common consensus' of conspiracy-theorists.
A lot of childish reactions have been made as so called reviews, but I'll attempt to actually review the movie.
While very flamboyant and direct in his approach, Alex Jones focuses on Police officers overstepping boundaries and using the Patriot Act to do so. This includes a large section of Alex talking about the arrests of protesters during the RNC in New York. He is somewhat too confrontational at this point and tries to goat on-duty police officers into overstepping their bounds.
The other main focus is 9/11 and the conspiracy he believes lies behind it. Unlike other documentaries on the subject "Martial Law 9/11" tends not to focus on zoomed up footage or the pentagon but rather quotes news articles about the event that were lost in the confusion of the initial days. While not entirely convincing, he brings up perfectly valid points that are dismissed by association by people that (for some reason or another) decided to watch a documentary they knew they were going to hate. For example that only buildings within the WTC complex were destroyed, including WTC 7, while much closer, more damaged buildings stand to this day.
I've also read a lot of lame-duck responses to his section on fires in other buildings throughout the world and them not falling. Instead of acknowledging this as a fact, the responses have been "if that were true the news would have talked about it case closed story over." This is a dangerous way of thinking and you're unintentionally giving truth to Alex's point about unthinking. If a firefighter or physicist expresses disagreement with official events and nobody decides to report it did he really say it?
The movie has flaws, and Mr. Jones can be a hand-full, but don't bother watching it if you already have made your decision. If you read some immature reviews with bad grammar, name calling and run on sentences and it convinced you not to watch this, I doubt you're an intended demographic.