Well I dislike the fact that a 2nd level PC could theoretically enter this PrCl.
As it is a fighting specialism it should have a BAB requirement and possibly a Weapon focus requirement.
Ex-blade: Any blade who wishes to become proficient with a non-bladed weapon or becomes a lawful alignment may no longer progress in level a a blade.
This is a strange rule - A Fighter, Barbarian, Ranger, Rogue level gives such proficencies and even taking a Bard level breaks this. It might be good to clarify this.
Mage blade: The prerequisite is unclear, does this mean they much know the spell or that they must have cast the spell.
Lightning Blade: No save DC.
Blades of Fury: Not sure I like this at all, but it should be a Will save (there is no will check) and what is dreadful panic? Shaken, Frightened or Panicked? I would suggest the first.
In general I agree that it is a bit heavy on feats and abilities.