This is a parody, therefore there will be 'moronic' and 'idiotic' moments, like many of the 1 star reviewers stated, but isn't that the point of a parody? Space Balls, Robin Hood: Men in Tights, Hot Shots, Airplane, etc, don't all those films have there so called moronic and idiotic scenes? It's supposed to be to make it funnier! (Besides, moronic, stupid, idiotic, whatever you want to call it, it's hilarious!)
It has been a while since I laughed so hard during a movie. Many people praised 'The Hangover' for being hysterical and yet I did not laugh until the ending credits scene. This movie made me laugh the most and I don't remember a film that made me laugh so hard even when I watched it again.
I never witnessed MacGruber on SNL, so I didn't know what exactly to expect, apart from for what I saw on the trailer. With that said I don't think you have to be a fan of the mini sketch or have watched it for that matter to enjoy this movie.
Watch MacGruber and try NOT to laugh!