Played my mage for the first time in MoP. Got to 87, some random thoughts.
Frost orb is amazing, way better then flame orb. Though I don't think they had to remove flame orb, just could have kept it exclusive to fire. It was a neat looking spell, and I will miss it.
Mage talent tree is the worst in the game, very boring and bleh choices. The 90 talents seem more frustrating then fun to use.
Alter time is underwhelming, I would imagine it's actually a pretty good CD, but it's just very flat.
Icicle mastery seems a lot worse then the old frost mastery, but I think it looks awesome, it reminds me of that one cutscene from FF8, which is why I have always liked ice magic so much.
I will miss blastwave.
The new glyphs to change the appearance and size of the water elemental are very welcome, that thing has not aged well.
Also, can a 90 mage solo heroic End Time? I don't really have a concept of how powerful 90's are yet.