I like a system that doesn't make you play a wizard in order to have interesting choices to make (including the possibility of getting them wrong).The D&D Essentials Fighter sub-classes (Knight and Slayer) and the Skald from Heroes of the Feywild show much better templates for what "at-will powers" need to be for characters that use the "Making Sharp Things Go Through Soft Things That Scream and Bleed" skill to attack than anything in the 4th Edition PHB or PHB2. Their Encounter Powers fit the bill well too.
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Sometimes front-loading the options before you even roll dice is a pain you don't need for seemingly simple actions. It involves a bunch of extra calculating to make the optimal play. Also, being forced to make set-up choices every round leads to people screwing up order
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Some character classes and builds thrive on picking the right rabbit out of your hat every round. Traditionally the ones with the largest variety of bunnies in said hat are Magicians