What type of content do you focus on? [PvE/PvP/Both]
While I do PVP occasionally, my focus is certainly on the PVE side of the game.
If PvE, what type of PvE? [Heroics/Raids/Other]
I'm the leader of a raiding guild on one of our smaller, less-progression-crazed servers.
What are your biggest quality-of-life issues?
First, fundamental differences between specs - not in terms of their damage output, but rather in terms of the amount of work required to make X spec produce Y damage. Arcane is, quite simply, too easy to play, and produces the most output for the least input, compared to other specs. It's relatively difficult to tell a mediocre mage from a great mage these days, when our rotation (somewhat cynically, I'll admit) boils down to "Push 2 a lot and then evocate."
Second, a quibble about itemization. The single best item in the game for an arcane mage drops from a heroic-only end-boss. My problem isn't with a heroic boss dropping heroic loot, which is great - it's that the Sinestra trinket is game-breakingly good for an Arcane mage, and has too profound an impact upon how we play, for being just one drop from one relatively inaccessible boss. It's the same problem that lead you guys to move away from "Interesting" relics, and move to ones that just had raw stats on them. Items from a raid tier should not be so powerful that they aren't replaced in the subsequent raid tier. And I know you agree with me, because you folks say that about Legendaries all the time :)
And, how about some more portals/teleports, for the hell of it? Give us a couple locations of interest around Kalimdor/EK, just to make getting around a little more fun?
What makes playing your class more fun?
Fights that require me to push more than two or three buttons, or do things other than focus entirely on an optimal DPS rotation 100% of the time. Encounters that reward me for playing a little bit defensively (Slow Fall, Mage Ward, Mana Shield) make me feel clever for remembering that I can do something other than be a glass cannon.
What makes playing your class less fun?
Arcane's rotation. It is too simple not to use it in a raid environment, but is at the same time so simple that it just isn't that fun. Mana management should be complex, but really isn't, especially with the Sinestra Trinket (see above), and it's confusing that the specs with more complicated rotations (fire) or ridiculous proc-based rotations (frost) do comparatively less damage, since they take more effort to play correctly.
How do you feel about your “rotation”?
See previous answer :D
What’s on your wish list for your class?
Arcane needs an overhaul. It's got some neat cooldowns, great damage output, and that makes us feel cool, but when an Arcane mage does really great DPS, it's because they're an arcane mage, and not because they're particularly good at anything they're doing.
Frost needs an overhaul in PVE. The complexity of the procs involved should be simplified, or the damage you produce for playing it correctly should be amplified. It's just too much work for too little reward at present.
What spells do you use the least?
I don't Mana Shield much. Most AOE damage that is going to hit me is elemental-based, at least in Firelands, making Mage Ward a much better use of a cooldown. Plus, if you've ever had the Incanter's Absorption knockback send Sons of Flame -into- Ragnaros' Hammer, you'll never want to cast Mana Shield again. Presence of Mind was fantastic back when Pyroblast took a year and a half to cast, but buried deep in the arcane tree where most of your spells are already under two seconds, it's underwhelming as DPS cooldowns go.
Oh, and frost Nova got taken off my bar a while ago, in PVE. Once a staple of staying alive as a mage, rooting a group of mobs to the ground so that they try to kill any of my friends who are unfortunate enough to have been standing next to them instead of me is just not a good trade in exchange for my own health. But that's more an issue with how Roots work as CC in general, rather than an issue with Frost Nova specifically, I suppose.
Also, you didn't ask, but I kind of miss Amplify/Dampen Magic. Amplify was, I suppose, a little irritating and over-used, but identifying the fights where Dampen was a good idea was kind of cool.