I guess what truly creates a "better" class is the feeling that your moves are not only powerful, but shiney and chain together very well. Personally I've never felt a shadower's moves play off of each other very well, and usually you're stuck using just one move over and over again.In comparison with a dual blade who can use several different moves, one after the other with booster, a properly eliminate a group of monsters.
But if you sit down and compare a pair of classes number per number looking at it strictly from a DPS perspective, the idea of a class being "fluid" is thrown out the window.
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