A game that hopes that you like grinding single player, but is good otherwise.
In the beginning, you start out with a below average deck. Since the only way to get cards is to play single player, (and depending on how well you do, you will get few to some cards) you will spend a fair bit of time before you can make a deck you like. This isn't really the worst problem for the game, although having a DP (Duel Point) system similar to the ones in the DS games would have been much better.
The thing that troubled me most was the number of cards in the game, which is about 1000. This leaves out very many cards, and leaves certain decks with only a few of their options. Aside from having to grind, this is the main reason for me not rating this higher.
Aside from those issues, the game is quite fun. Dueling online is great and once you get the cards you like the game is very enjoyable.
To wrap this all up, Decade Duels is a game for those with patience, and don't mind waiting to get to play using the best cards.