Check here for more info.
Due to a bug or some crap like that you have to pick the option all the time after switching characters, atleast the first time. Maybe its that?
Would kinda suck having to complete inferno first. The game is too easy so why not have MP already at low levels.
Blizzard about balance:
PvP: Execute Melee/Needs Rage(issue) 30k noncrit : Shadowburn Ranged/mana(nonissue) 130k noncrit, can you explain?
-We try not to design abilities to be mirror images of each other.