What makes Rangers worse tanks than Shadow Knights or Paladins?

[Deltaloko]

google skill definitions:

the ability to do something well; expertise.

a particular ability.

and wikipedia:

A skill is the learned ability to carry out a task with pre-determined results often within a given amount of time, energy, or both

from websters:

the ability to do something that comes from training, experience, or practice

the ability to use one's knowledge effectively and readily in execution or performance

dexterity or coordination especially in the execution of learned physical tasks

a learned power of doing something competently : a developed aptitude or ability

By virtually every defition of skill, playing a game like EQ requires skill.