What's the drawback of charging then? (In that it seems like it essentially gives you a free move action followed by a +1 to attack. So why wouldn't someone charge in to attack every time?)
Because you must use a basic attack when you charge. So you can't use your nifty at-will powers like Cleave, Twin Strike, or Enfeebling Strike on a charge.
There are of course exceptions, when a power specifically says it can be used on a charge, such as Howling Strike.
Edit: Too many ninjas here.
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