Third person is for teenagers and idiots.
It disrupts immersion and ruins your aim and depth perception.
Often you find it can help with strafing and avoiding projectiles left and right due to extra perception room to the left and right but forward/backward collision detection always suffers.
You either stop short of your target or give them a hug.
I did a little test with Forza 4 and Minecraft...no matter who tried they either swerved constantly or got blown up by creepers.
...and Warewolves had a choice of 1st/3rd person in Morrowind
