These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Lord Darkseid understands some of you worms may not be satisfied with your petty explanations of his greatness. That is why he has allowed these... contentious issues... to linger. Beware, for he may turn his attention to you... and there will be no longer doubt about what Darkseid is.
Anti-Climax Boss: The Smallville version of him is a much bigger threat when he's a disembodied spirit spreading malevolence amongst the people of the Earth. As soon as he gets a body by possessing Lionel Luthor, Clark very easily takes him down.
He's the ultimate God of Evil in the DC Universe and the Trope Codifier for Dystopia Justifies the Means. As the ruler of the world Apokolips, Darkseid subjects its denizens to hellish conditions with the overwhelming majority of the population ill-treated slaves. The other New Gods fare no better as Darkseid is only too willing to subject them to hideous tortures or obliteration should they fail him. Darkseid detests all that is good in the universe and seeks to extend his influence everywhere he can. During Final Crisis, Darkseid murdered his heroic son Orion to permit himself to gain dominion over Earth. Once there, he enslaved the minds of everyone he could touch, turning them into savage parodies of themselves, intending to as he said "murder their souls and take them to hell without end." His ultimate motive is to use the Anti-Life Equation to rob everybody of free will and turn them all into mindless zombies who worship him as a god while he tortures them eternally, just for fun. Just as bloodthirsty and monstrous as any of those who serve him, Darkseid combines urbane sophistication, limitless cruelty and insatiable drive for power, and is the one single villain that all the heroes despise and fear.
“I hope you appreciate, Kal-El, that everything that happens from this point is on your head. The skies will rain fire, the oceans will boil, the streets will run red with the blood of billions. Only then, after your last pitiful hope is extinguished, will I end your life.”
There's a reason that Batman, the living Though Shalt Not Kill epitome, tried to kill him during Final Crisis.
Evil Is Cool: He was easily the most popular character from Jack Kirby's New Gods metaseries, and he went on to become one of DC's most popular villains afterwards.
Game Breaker: His Omega Beam, which is nearly impossible to avoid or survive as long as he can see you.
Lawful Evil: Type 4, though with shades of Type 1 & 2 thrown in. Darkseid desires an ordered universe and has a twisted (and sometimes, optional) code of honor, but ultimately and above all he desires to eradicate The Evils of Free Will, happiness and goodness because he's a monumental bastard and wants everyone everywhere to worship him as God, and to suffer and die for his pleasure. Though he finds reality to be random and chaotic, he would never be content to allow someone else to be in charge of correcting that and he finds ideas like freedom, love and joy to be part of the problem, not to mention he could never live in a world where he couldn't make people as miserable as possible and hold ultimate power over their fates in his hands.
Love to Hate: A prime example of this, his fans agree that how appallingly evil he is a part of what makes him such an awesome villain.
Magnificent Bastard: Almost all incarnations. Most notable in Smallville when he's only a disembodied spirit and still manipulates everyone effortlessly. There's a reason he chose Lionel Luthor as his final vessel.
His DCAU incarnation which has him brainwashing Superman to send him against Earth. If Superman finishes the job, then Earth is softened up enough for him to take over. If he doesn't succeed, then Superman will be feared and hated by the people of Earth who he had worked so hard to get the trust of.