Marik could've been an interesting concept as an innocent
manipulated GASLIGHTED (
) and tormented by a personified dark side, but that was quickly ruined with how incompetent many parts of his overall plan was (putting one of his God Cards in the hands of a puppet rather than using it alongside Ra in his deck, almost losing to Joey/Jonouchi due to being too obsessed with Ra to sacrifice it and use Lava Golem, etc.) and
Melvin Yami Marik was just evil for the sake of evil without any catalyst for it. Marik's backstory was OK, but his dark self being a possessive force rather than one that grew within him being what killed his father made the drama hollow. Proof that Gemini Saga from Saint Seiya is still the only Shonen villain to have pulled off this concept well.
2/10 for still being a decent idea and superficially Yami Marik has a pretty cool design. YGOTAS Marik/Melvin is a 9/10 for entertainment alone
.