Pros: good introduction to global warming
Cons: some details could have been more accurate
An Inconvenient Truth is a good film and good basic introduction to the science behind global warming. Gore and his film have taken a lot of heat from people who don't want to believe that humans are causing global warming. The bottom line is that the fundamental science in the movie is sound. There were a few details that could have been presented more accurately, for example specifying the timeline over which sea levels are projected to rise, clarifying that Hurricane Katrina was likely strengthened as a consequence of global warming but would have formed anyway, etc.
Nevertheless, most of these points are very nitpicky, and a result of people trying very hard to find flaws in the film because they don't want to believe its message. However, as I said, the basic science in the film was correct. It's a good introduction, but I do recommend doing further research into the science of global warming beyond simply watching this film.