Saints Row 2

This is probally one of the quickest game modes you can do, all you have to do is follow the marker's to the locations given and take care of the crime. The way you resove the crime is simple kill any marked target.

hints and tips:

.make sure to watch out for your camera man get smoked as this will fail the mission if you don't revive him

.All ways use the weapon the camera man tells you to use as this will give you extra film

.make sure not to kill every one the same way as it will not count, you know you are doing this when the game says "the camera man has enought fottage of you running people down"

Although SkillfulMmd has a nice solution put up already, I found an even easier way to get these activities out of the way. You will need one of the 3 following vehicles:

Bulldog - Unlocked by completing all Sons of Samedi missions. You can also steal one during most of the Brotherhood missions by going to Donnie's garage.
Bear - You can get one by finishing the Ultor epilogue missions, or racking up police notoriety until one appears.
EDF Scout - Buy the DLC "Ultor Exposed"

The rest is fairly straightforward, massacre whatever the camera guy wants you to without even getting out of your vehicle by using the mounted weapon on the roof. Since you can kill as many people as you want with the mounted weapon without the game telling you that there is enough footage of you using it, you save a lot of time in the end by doing this, even though you don't get the extra footage boost for killing the perps with the weapon the guy wants you to kill them with.

Using the Bulldog, I was able to complete all 12 levels of this activity without ever failing/having to re-do any of them. Just make sure that if your vehicle is smoking and looks like it needs a fix, exit the activity and visit a nearby mechanic before continuing.