Violence is usually off-screen and pretty mild. Occasionally it gets relatively ramped up.
A man is seen dead, having been shot off-screen, this is upsetting.
An electrical circuit explodes and a man is presumable electocuted and killed.
A police car blows up and it's stated afterwards that two people were killed in the explosion.
A guard is abruptly stabbed in the back with a spear, killing him; another gets thrown through a wall and killed. The spear is slashed across Spider-Man's chest, leaving a large, brutally bleeding gash.
The Green Goblin quickly kills people via neck breaking or beating, not shown on-screen for long.
A dead body is seen splattered with blood, having been killed in a falling elevator crashed.