As for the cost, one should remember that the game itself is completely free of charge (you can also download online). If you consider that a normal game around ~ costs 50 Euros, so you need about 500-600 duels play (depending on the source of the duel passes) until you come to it - a challenge that should take the normal people probably many months to complete ,
Personally I play this time-dependent concept rather than monthly fees á la WOW - why should the casual gamer to pay as much as the 24/7 gamer?
In addition, as each duel has costs, which reduces the incentive game for idiots.
The technical implementation is mM after ok - though there are from time to time minor bugs in the complexity of YuGiOh rulebook but hardly surprising. Only negative about the show are the mE quite unimaginative new booster series, which is why I also do not more games. Also negative is the dominance of some monster - if you (initially) has only 1500, make an enemy with 1900's simply flat without it they would have to play well, which makes the game initially depressing.