Not talking about the gameplay itself, but the implication of having familiar characters.
"It's the same damn ___" is common argument among players.
Edit: I think the main reason we play DW are for characteres and plotlines, not really loot grinding or actions.
That...is nothing like Mario Party, honestly. Mario Party games are simple minigame collections designed with board game motifs that contain no real story to speak of. The characters do cater to fans, but not in the same way. There's really nothing to talk about regarding the characterization in Mario Party. There's no historical background to the Mario Party cast. It's not like a person could compare Mario to, what, the old landlord Nintendo named him after?
This is just a comparison that makes no sense. Also, I've never had a problem explaining why Dynasty Warriors is worth playing from my perspective. The bigger issue I've encountered is running into people that are just unwilling to listen.