As Yugi games go, this is the best yet.

User Rating: 7.3 | Yu-Gi-Oh! Nightmare Troubadour DS
I can comfortably say that without doubt this is the best Yu-Gi-Oh game to date. It has all the cards (up to the date of release) and all the rules. The tutorial mode is excellent for teaching new players how to play the games and the challenges test even the best of real-world players.

The main criticism I would have (and it's a criticism that can be said about every single Yu-Gi-Oh game ever) is that the 3D monsters and their respective battle sequences are still pretty appalling looking, and now that they've got the gameplay elements perfected they really need to start working on those monsters...