Look at the cast! It MUST be good, right?! Wrong!!!
Don't be fooled by the fact it's directed by the (usually) brilliant David Zucker and stars Leslie Nielsen, Dennis Hopper and Kelsey Grammer. This movie is absolutely terrible, it's shockingly unfunny and unbelievably right-wing.
After a mildly amusing opening 10 minutes, the film descends into a barrage of awful political pot-shots at the American left. By halfway through this film you will be in no doubt that you are just watching cringeworthy right-wing propaganda. I wouldn't actually care about that if the film had some cleverly crafted jokes to back up its political statements, but it doesn't... AT ALL! You can only make the joke about Michael Moore being overweight and self-important once, but that's all this film is! Endless, really bad jokes about Michael Moore being fat and self-important.
To draw a comparison with another comedy that satirized American politics and succeeded, Team America. That film ripped on EVERYONE and did it brilliantly. No political views were left unmocked, and it actually made you laugh at your own political views, as well as others. Big Fat Important Movie is just a series of awful "gags" and right-wing statements. What makes it even more dire is the fact that it never backs up any of its statements, leaving it bereft of any integrity whatsoever.
Anyway, what I think this film was trying to do was to endlessly mock the political left to the point where it just seemed ridiculous, but it completely backfired in this instance. This film made me cringe, and not in a good way.
Oh yeah, Bill O'Reilly has a cameo in this film ...TWICE! Nuff said.