Alright, you want some cold hard facts? Here ya go:
- Fire is out of control with Scaling. It sucks horribly at the beginning and is too good at the end due to Crit scaling way too high. SINCE LICH KING (that was two expansions ago), it's been reported that it needs fixing. Blizzard has done nothing but made us too good at the start of 5.0 and decided to continuously nerf us, still leaving the core issues of RNG and retarded scaling.
- Arcane is too immobile and has nothing to do with mana (either stay above 90% mana or drain it and get it back) as much as they say it does. It's a proc-fishing spec that's super mindless. Arcane has always been very immobile, but this is the first expansion where mechanics are really pushing fights, so it's more of a fatal flaw than ever. The Mastery needs a serious rework as it doesn't really interact with anything but rather force us into two mindless rotations that we get to pick from.
- Frost has the opposite as Fire when it comes to scaling: It scales too poorly. In addition, two of its stats, Haste and Crit, cap waaaaaay too easily. Frost also has a huge issue with multi-target fights where they have to constantly swap because of the annoying Frostbolt Debuff for maximum damage, plus a retarded pet UI that makes you want to kill something. Frost's Mastery is also too good in PvP and too weak in PvE. A nice killing-of-~three-birds-with-one-stone would be to make it really good in PvE and fairly mediocre in PvP. This would solve: Haste/Crit capping issues as Mastery is now the best stat for PvE, Frost PvP Burst, and Weak PvE Mastery.
- The class as a whole works horribly with the L75 and L90 talents. The Bombs feel forced into Fire and Frost by how they (now) interact with them. Arcane they're pretty strong due to the mastery, but also feel phoned in. Besides Fire, Mages were NEVER known for using DoTs until this expansion. L90 talents, just... no. They need to be destroyed in a fire.
With the exception of my views on "the class as a whole" the spec-specific problems are FACTS, not OPINIONS. No one can deny the scaling issues of Fire and Frost. No one can deny the immobility and mana-pointlessness of Arcane. Some of these issues have come as late as 5.0, while some as early as 3.0. All I know is we continue to go ignored and remain to be a broken, outdated, class, that only has competitive DPS because they make our spells strong enough to be viable. Yeah, our DPS is fine, but how we do the DPS is NOT fine.
No we don't.
High mobile? Sustain extreme amounts of damage? Have you even PLAYED a Mage? We're good at immobile fights and as far as taking damage, we're good at taking ONE, SINGLE, large hit. We're TERRIBLE at taking a large amount of small hits (even with Flameglow, which is what it's meant for, we still take too much damage).
Please, just stop.