Yugioh is a game all about dishonesty. It's been in the game's nature from the start. It's all about pulling out the secret trick up your sleeve that the opponent didn't see coming, and how actually I have a force-field so your gun didn't hit me.
Worrying about "Ermmm that card breaks the rules because it says it can do something good!" is just cope for scrubs who get caught off guard by decks they don't know, or continually lose to the same decks because they're bad.
Maliss is busted because it's busted. Not because it bends the rules of the game like every other deck does.

I like 5D's.