“That guy sucks” is the oldest, lamest and biggest cop-out of an insult that you can use to characterize a person, place, team or thing’s supposed inferiority.
When you say Sidney Crosby or Alex Ovechkin or the Lakers suck or Duke sucks, you’ve lost the game. You’ve hit the bottom of the barrel. You’ve embraced the lowest common and least credible denominator of insults.
You have basically run out of creative ways to insult them. Because, clearly, they don’t suck.
Instead, you’re just telling the world that you are well beneath the point of trying to argue their supposed inferiority.