Base Breaker: Dallas and Juanita; though their commentary is funny at times it really gets kind of annoying when they always try to put Ratchet down during the fights. Dallas sometimes gets impressed with Ratchet's skill but Juanita rarely compliments the lombax.
Complete Monster: Gleeman Vox's schemes overall were not as wide-scale or devastating as the havoc Chairman Drek committed, but he is by far the more malicious and unstable in personality. Drek may have been a ruthless planet killer, but his end goal was singleminded greed at the expense of everything else—whereas Vox's goals go well beyond money and ratings and are end products of an unabashedly sadistic, bloodthirsty personality. Not content with merely kidnapping superheroes and forcing them to fight each other to the death on live TV, he keeps them safely imprisoned with collars that shock them or explode if they try to escape and demonstrates the collars on sentient robots. He also isn't above putting the entire planet of Stygia in danger by sabotaging the force fields that protect it from meteor storms, or attempt to murder everyone aboard his space station - including thousands of innocent audiences, some of which are children - all for the simple purpose of improving his ratings.
The Executioners, they hit hard, are about as sturdy as a tank, can hit you from a distance as well as close up, and show up everywhere in the last two-thirds of the game. Luckily, their shots are relatively slow, very predictable, and very easy to dodge.
Then there's the Laser Backs. Compared to the Executioners, Laser Backs are just as powerful, perhaps just as tough, have faster and harder to dodge attacks, track your movements whilst hovering in mid-air, and typically show up in groups of two or more. They basically look like giant flyingrobotic one-eyed crawfish with twin rapid fire machine guns that hit hard. If a group of these guys suddenly shows up, you'd better make destroying them your new top priority, especially if there are already Executioners around.
Fridge Brilliance: You actually get paid for getting Skill Points in this game, unlike the past entries where they were mostly a Bragging Rights Reward. Well, you are on a reality TV program, pulling off feats like that obviously improves their ratings.
Moral Event Horizon: Ace Hardlight had certainly crossed it a long time before the events of Deadlocked, but him not only murdering Captain Starshield on-screen, and almost killing Al, all with sadistic glee, makes it clear he's a irredeemable villain.
That One Level: The Orxon Dread Challenge "Scoring With The Blarg" on Exterminator difficulty. Enemies that hit hard? Check. Having to shoot a certain number of targets to win? Check. Not having control of the Landstalker? Check? No way to heal yourself? Check. The other Landstalker Rail Shooters on Shaar and Maraxus are pretty hard as well on Exterminator, but not as hard as this one.
They Changed It, Now It Sucks: At the time of release, many fans felt like this due to the drastic shift the game took. Platforming was even less of a focus, the maps were designed more for Multiplayer rather than Single Player, and the dark tone of the game put many people off. Such a reaction would not be seen by fans until the release of Ratchet & Clank: All 4 One nearly a decade later. In the case of both, detractors generally agree that while it is a good game, it is not a good Ratchet game.
On an opposite note, Deadlocked brought in its own group of fans that prefer it over the other, more light-hearted titles.