Profion (Dungeons and Dragons)
In this 2000 film, good Empress Savina is deeply concerned about equal rights and democracy for all, while evil Wizard Profion (Jeremy Irons) wants to rule all the land by ... OK, who cares, really? This movie was terrible, and Profion was the bad guy.
The case against him:
As far as evil wizards go, Profion is about as evil as they come. You can tell he's evil because he laughs at his own jokes a lot and hams up every scene he's in. Since he was portrayed by Academy Award-winning actor Jeremy Irons, you'd think there would be some semblance of craft going on, and you would be wrong.
Anyway, Profion seems to be the most knowledgeable wizard in all the land--the only real competition we notice in the movie is in the form of a highly inexperienced apprentice wizard named Marina, who throughout the film relies almost entirely on Marlon Wayans and some other guy to rescue her. Magically speaking, Profion could pretty much have his way with everyone in the entire D&D universe and there isn't a damn thing anyone could really do about it.
Instead, Profion spends the entire movie laughing at something he just said and looking out from his tower of doom at the destruction he has wrought while, again, cackling wildly at what a hoot the whole thing is to him. He also refuses to do any actual work and sends his lackey, Damodar, to chase the good guys, as if standing around and chewing all the scenery is a full-time job.
Merlin (Merlin's Shop of Mystical Wonders)
Merlin has returned after centuries of absence to open up a shop in modern day America, circa 1984. With his bulky wife, Zurella, Merlin gives away or loses a number of magical artifacts which wreak havoc ranging from summoning Satan to causing plants to die.
The case against him:
As legend has it, Merlin is one of the greatest and most powerful wizards who has ever lived. Part human, part demon, he is a being of supreme skill and wisdom. Various writings have shown Merlin to have the power of prophecy, telepathy, necromancy, the ability to conjure realistic and terrifying illusions, and even an Obi Wan Kenobi-like "force ghost" power to revisit the living after death.
For being the keeper of all magical knowledge in the world and for supposedly being all-seeing and all-knowing, the Merlin in the '90s made-for-TV Merlin's Shop of Mystical Wonders would seem not up to the task of working the graveyard shift at a 7-11, much less raising the dead.
Lacking a basic knowledge of economics, Merlin gives away items in his store free of charge to anyone who decides to stop in, and he relies exclusively on a puppet, uh, we mean dragon, named Gwendelin for his security system. When a street hoodlum foils Gwendelin and makes off with an evil toy monkey, Merlin recovers the item not via a location triangulation spell but by handing out 'have you seen me?' flyers bearing the monkey's picture. Why not summon the monkey back using his powers of teleportation? Why not travel back in time and beef up his store's security? Why not rain hellfire down upon the earth, destroying the monkey and most of the planet's inhabitants? Unfortunately, we may never know.