The reason I liked the film I think was because it tried to include appearances by most of the series' best characters. Sektor and Cyrax I particularly enjoyed.
At the risk of starting one of those silly arguments you see on IMDB where one person likes a film that another doesn't, I kinda didn't like the film for this very reason. It seemed like they were desperately trying to include as many characters as they could into the film, at the expense of, well, character, plot, logic etc.
Still, it passes 90 minues, which is more than I can get from an MK game lately (even one with Batman and The Joker in) and it is more faithful to the games than other movie adaptations of games that I have seen.