you must like tf2 for to make this and i like the idea to make an madness short to tf2 and good start.
try having them run around, add a little background, make them shoot at eachother and stuff instead of just having them stand there with some TF2 sounds going on
The animation was kinda poor, could need a bit of improving. I also didn't like the way you explained the plot in the movie. If this took an hour to make then I suppose with more time and effort, you could make something decent.