Megatronus Prime, debuting here, is known as the Fallen. Created by Primus as one of the original Thirteen Primes, the Fallen became obsessed with the notions of entropy and decay, ultimately attempting to murder his creator after betraying him to Unicron. Escaping the prison he was trapped in some seven million years before the 21st century, The Fallen visited the G1 continuity, gathered several Decepticon outcasts and kidnapped four Transformers, through which he tried to channel enough energy to break the Seal of Primus, awaken Unicron, and end all reality, boasting that his victims were but "casualties in the wars of the Gods". Sharing his master's unquenchable thirst for destruction, The Fallen is precisely the kind of servant that Unicron most needs.
General Robert Hallo was the head of military development for the United States Army. Obsessed with the idea of controlling the Transformers, Hallo had Adam Rook create a program that could remove the free will from Transformers, and hatched a plan to blow up the Ark II and gain a new robot army. After killing a man who attempted to blow the whistle on the plan, Hallo successfully destroyed the Ark II, killing all the humans on board and sending the Autobots and captured Decepticons into the Arctic Ocean. However, Adam decided to keep the program for himself, and disappeared not long after. Years later, after discovering Rook has been using the program to build a criminal empire, Hallo convinced Spike Witwicky to revive Optimus Prime. However, when showed that he had free will and refused to follow Hallo's orders, he had Optimus, his Autobots and the Decepticons hit with an air strike, intending to kill them all. Unfortunately for Hallo, not only did they survive, an enraged group of Decepticons began rampaging through San Francisco. To be rid of the Transformers once and for all, Hallo ordered the city to be nuked, and when Spike burst in to stop him, Hallo holds him at gunpoint and forces him to watch as the city and Transformers are destroyed. When Spike accused him of only caring about power, Hallo agreed with him, saying power is the only thing keeping Spike and his family safe.
The aforementioned Adam Rook, aka Lazarus, is just as bad. After designing a program that would remove the free will from Transformers, Adam decided to render the deaths of everyone aboard the Ark II meaningless by stealing the program and disappearing before Hallo had a chance to use it. Motivated by greed, Adam took the name Lazarus and built a criminal empire, using the program to force Transformers to work for dictators and terrorists, helping them stomp out their enemies without casualties on their side. He even forced good guys like Bumblebee, Ratchet and Ironhide to work for killers. Sometimes, he would take "customers" on tours of his base, and would make the Transformers kneel to him to show his power over them. After three years of running this successful criminal empire, Lazarus had a group of Transformers slaughter an oil refinery in the Arctic as a demonstration to potential buyers, and casually began auctioning off all of them not long after.
Deader Than Disco: The series went through this hard. When it was first released in 2002, it sold millions of copies, with the original miniseries cracking the top ten in sales charts. However, criticisms of the series mounted over time with regards to the tone, plotting, and art style, and once word broke out of Pat Lee's criminal behavior, public opinion of the series flipped completely into hatred. Since then, aside from War Within, the series has pretty much vanished from the eyes of both the fandom and Hasbro (outside of the occasional Sunstorm toy), and many of the writers and artists who got their start there seem to regard it as an Old Shame. Even stylistically resembling the Dreamwave comics is enough to get alarm bells going in some circles.
Ensemble Dark Horse: This series portrayal of Sunstorm was beloved and has become the definitive depiction of the character.
Magnificent Bastard: Megatron at the start of the war. After Wreck-Gar accidentally restores the memories Megatron lost in his first fight with Optimus, he becomes this once more.
The Fallen. Unpublished issues would've revealed that Shockwave, Jetfire, and Sunstorm were all just his unwitting pawns.
Moment of Awesome: Optimus Prime's Patrick Stewart Speech in the first miniseries and the fire department of the city then proving him correct by slamming their fire engines into the Decepticons, buying Optimus precious time. Awesome.
Overshadowed by Controversy: Dreamwave is remembered far more for its shady business practices (not paying numerous employees being one of the most known claims) and controversial bankruptcy than for any of the stories it told. The stories themselves fell into disdain with many future series, IDW in particular, outshining them easily and much more attention is paid to the infamous art flaws than any of the positives.