As I have stated in a recent rogue topic, I believe many people are overly concerned about cross-class equality.
The first priority of a raiding guild should be taking competent players that are able to perform their role in an encounter in order to defeat the boss.
Instead, I keep seeing massive QQ about how warriors scale better with AP than rogues, or rogues are the only people that have to manage their resources. Blah blah blah.
Everyone go watch videos of arcane mages in LK spam arcane blast and watch them oom in 8 casts. But they have outside resources that they have to manage in order for them to regain their mana (they also have to use a non-top dps rotation to keep from ooming).
Make everyone afraid that they will go oom quickly and it will all be more fair, and make the game more challenging.