The single most common method of illegal entry is simple force - kicking in the door. The best lock won't prevent a break-in if the door edge and door frame aren't reinforced. A cheap lock in a reinforced door will withstand a physical attack better than a fancy lock in an unreinforced door. Below are some photos of the aftermath of physical attacks. The locks haven't failed, the doors or door frames have.
When the door is kicked, the most likely part to fail is the door frame. The second most likely is the door edge. Sometimes, the hinges can give way as well. Door Devil anti-kick door reinforcement packages address all of these weak points.
Only after the door is reinforced does it make any sense to upgrade the locking hardware on your door.