Lets be honest, TCGs became unplayable with the grwoing popularity of the Internet.
Before, you played Magic, you played YuGiOh, you played every game you liked, and every match you played had a new unique deck to play against, because noone knew the "I win" decks and everyone was using own decks
It's R$100 Jo, you'll get way more than your money's worth.
But have you played the other 2? They're not even close to 3 quality-wise, but the story is EXTREMELY linked between them, in fact there's a lot of quests that reference your actions in the first two games.