Is Mendez that bad?
He's an agent, his interest is his client, not United/Madrid/Etc. He gets the best player, he sold his player for profit, what's wrong with that? Big agent fee? Well kudos for him that he can get the best out of what he does best. If we made Madrid pays 100M for DDG it doesn't mean we're evil, it means we're having a good business.
He didn't badmouth anyone directly, and spreading rumors and hearsay are agent's bread and butter, everyone else is doing it.
What's so bad about Mendez?
His interest is himself, nobody else. Did it really benefit Falcao to be stowed away in Chelsea for a wasted season?
Mendes is more like a mafia boss than an agent. He has way too much power.