Hmm...great concept? check. Great reference? check. Great card game? check. but wait........God damnit energy!? Based on how difficult some of the rounds can be, the amount of energy needed and amount gained per minute is unrealistic. Plus it's a bit hard to "test" decks when we're so constrained on the amount of tests we can even accomplish.
For people. Server 1 is good because it has pros which make good high leveled leagues but its hard to beat them. Server 2 alright not much level 30s its easier to beat people but harder to get good leagues.
I Never saw a level 30 or over with those weapons you unlock when you play in Dragon Zone like No one ever uses the Boomerang and The Rocket in server 1 they keep getting it but dont use it.
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You can Duel your friends on the left sidebar to test your decks as well :)