It depends, is the answer.
Games have ratings much like films. He's 10, so would you let him watch adult rated films? I hope not at least until he's mid teens. Same goes for games.
The quantity of time on the other hand needs moderating.
Obviously this will change with his age.
Edit to add: yes if you control and repress to much, they will rebel later probably more than if you are balanced when they are young.