This is a superb editing job and certainly a convincing portrayal of a world inhabited by super heroes. This is 50 minutes of none stop action.
Technically the sound editing and cutting are absolutely faultless but the problem lies in a lack of cohesive narrative.
The films that have been utilised stay within their own bounds and never interact with each other. As the world is coming to an end and cities are being ripped apart, Peter Parker is in his own universe fighting his own adversaries, and so are the X-Men and so is the Hulk.
Some linking of these Super Hero worlds would have been interesting and added to what came so close to a Fan-Edit classic.