Allllrighty. Played what I can of the trial.
The single player mode is set up by different points in the series' different arcs/seasons or whatever. IE. YGO > GX > 5Ds > Zexal. Each story has 4 different tiered ladder modes that have four matches each. I would assume with the bracket provided (which started with Tea Gardner) get's harder with every match played. Win or lose, you still earn cards for your deck that you can build.
There is no card shopping. If the game HAD a card shop system, the grind to get better cards would be MUCH more tolerable. Having in-game booster packs/specific decks would be much better than this random 'by chance' card bullshit.
The AI is admittedly still as hard and annoying as ever. Different deck sets that can easily outmatch the ass-tier cards you're given.
It seems as if nothing has changed from Decade Duels to this, so I'm gonna say
No, don't buy this fucking game.