Guild Wars 2

Once you have a valid target for your skill, it will miss if the target is not on the (i think is around 60-70 degree cone) cone vision of your character.

In Guild Wars 1 you didnt have this problem. Your character in PvP will have executed the skill automatically and look at the valid target.

Melee characters-> If you have a valid target in GW 2 but the target is not on the cone of vision of your character, the melee character will executed the skill forward.
In GW 1 you didnt have this problem. If the target was besides you, your character would look at the target automatically and execute. The problem in GW 2 is that is a constant race with your mouse to execute a skill.

Range Characters-> Same here, you have a valid target, said target is within range of the skill, you will miss if the target is not on the cone of vision of your character.

What think is, if you have a valid target for a skill, said target is withing range why should the mouse fight you to the very end to execute said skill? If I was playing with a joystick a la action/hack ‘n’ slash games for consoles it wouldnt be much of a problem since you could use the second joystick and even then games like these have an autolock feature so the camera is fixed on your target.