Fridge Logic: There's a gun that can shoot from around corners so you don't have to get out from behind cover. This initially seems very useful, except for the fact that the guy it's being used against can curve bullets around corners anyway.
It gets worse than that, Fox wasn't even behind cover, she was behind concealment, given that the object in question was a grocery store shelf full of cereal. The only thing protecting her was that Cross had no interest in accidentally shooting his own son.
Fridge Brilliance: Concealment was all she needed at the time. Lack of line of sight made it so Cross couldn't make a legitimately accurate curved shot without risking Fox dodging and thus hitting Wesley. That also lessened the strike zone where he could safely shoot Fox, thus making it quite easy for her to avoid getting hit. Anyone can dodge a bullet if they know when and where the shot will happen.
Fridge Logic: During Wesley's assault on the Fraternity base, everyone shoots straight down at his garbage truck before he unleashes the rats. Not one of them tries to curve a bullet around the front or sides, since the roof of the car seems to be made out of kevlar and adamantium.
Fridge Brilliance: When Wesley is first taken to the loom room, Sloan finds the code, writes it down, and deciphers it far too quickly for him to not know what he's writing in advance, as he made up the kill order.
Further shown when Wesley receives his next kill order - Sloan REMOVES the fabric kill order from it before giving the paper to Wesley.
This is the reason that the Loom targeted the rest of the Fraternity: since Sloan, who was slated to die, turned them into his own private assassination team, the Loom put out kill orders on the rest of them to stop him. Had Sloan kept to the code, the others probably wouldn't have been targeted.
Fridge Brilliance: It's pretty clear early on that the Fraternity isn't all that it seems. First off, the targets are all apparently in the same city. Secondly, there's no way that assassinations for "fate" would allow them to maintain the relatively large amounts of weapons and personnel that they have, let alone giving them discretionary funds on the level of what was transferred into Wesley's bank account.
An alternative interpretation on who the original Killer might be? Check out his boots in the first scene as he chases after the assassins. Boots with intricate webbed detailing, walking on walls, crazy reflexes, unerring aim ... does anyone else think of a middle-aged, bisexual, gun-toting Peter Parker?
Or, if The Killer is Deathstroke, who's Weseley? Young man with relationship issues who's recruited by a cabal of supervillians who reveal that he's the long-lost son of a legendary assassin... Wesley is Grant "Ravager" Wilson.
Fridge Horror: It gets really damned screwed-up when you realize that any child would love having Wesley's dad. Which would you prefer; a mother who did everything she could to make you an Extreme Doormat, or a father who did everything he could to make you The Ace (at least as he saw it)? If Wesley's mom wanted to protect the world from her would-be supervillain offspring, why didn't she just get an abortion? The Original Killer was capital E evil - except that he was a great dad.
Fridge Logic: There are many ways that the book seems to be a deliberately poorly-thought-out power fantasy. Why is money important to the supervillains when they can take anything they want with total impunity? Why exactly is Rictus so much worse than Wesley or Seltzer? How would being openly in charge of their planet grant the super-villains more inter-dimensional attention than actually doing inter-dimensional super-villainy does? How does any random beat-cop automatically know what "Fraternity" is, but not people further down the social spectrum? How could Wesley and the Fox know the second the Sucker reached his time limit, if they weren't present when he acquired those powers, and even those who actually were didn't seem to pay attention to time?