S
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Classes in this tier are the absolute best when it comes to fulfilling a specific role. Likely, these classes are the most desired for their proficiency in Raiding or Battlegrounds. |
A
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Classes in the A tier are typically well above average when compared to other Classes for this specific role. A Classes will typically have some unique advantages through Spells and Abilities or specific Talents that give them a leg up on their competition. |
B
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B tier Classes are average for that role. They do exactly what is needed of them, can sometimes be interchanged with other Classes in their tier, without skipping a beat. |
C
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C tier Classes are noticeably below average at fulfilling a particular task. Typically, when a group is looking for another member, they might wait to invite a C tier Class, in case a slightly better Class becomes available. |
D
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D tier Classes are usually Classes that aren't really designed to excel in a particular role or task. More often than not, there is a better Spec that Class could re-roll, to improve that Classes viability. |