Broken Base: Is it an awesomely dark take on a popular character, or a collection of mean spirited, upsetting murders of beloved characters? This is the kind of series that splits opinions.
Fridge Logic: Spider-Man and Thor should have been able to avoid their deaths. The former has a spider sense that should have warned him not to get close enough for Deadpool to shoot him, and the latter should have been able to control the trajectory of Mjolnir to avoid being crushed by it.
Furthermore, even if he had been crushed under it, it's unlikely it would have hit Thor with enough force to kill him. If it had, the planet probably would have been shattered along with him.
Heck, a good portion of the deaths in this series could count as Fridge Logic. How did Dreadpool manage to get into Avengers Mansion, kill Hank Pym, and plant dynamite in the meeting room all without setting off one of Tony's alarms? How did Dreadpool kill the whole of Cosmic Marvel with Galactus, when characters like Eternity and The Living Tribunal outclass him?
Moral Event Horizon: Dreadpool crosses the line pretty early on and gets worse from there. Taskmaster personally feels that him murdering the Power Pack is the big line crossing moment.
The Woobie: Amazingly, Arcade, whom Dreadpool is forcing to build death traps, is traumatized by what Dreadpool has forced him to do.