Bloody, disturbing, episodic, and absolutely the most perfect Deadpool story that needed to be told.
Contrary to what many of the reviews say, there is a distinct reason Wade sets on killing the entirety of the Marvel Universe... He comes to fully realize that his life, and the lives of everyone in the Marvel Universe, exist only for the entertainment value of an outside observer: Us.
It's not random, it's not pointless, it's not about blood n guts (though they are present in spades). It's about finally ending the constant torment that the people in the Marvel Universe endure for nothing more than our own entertainment. Wade doesn't just want to break the fourth wall, he wants to tear down every wall he sees.
In this story, the reader comes to realize that Wade's breaking of the fourth wall is far more sinister, disturbing, and existential than most previous writers have implied. He knows that the struggles, the pain, the deaths and rebirths are all the result of other human minds creating fiction. He never says this on-the-nose, but it's abundantly clear that he's ending the charade of the Marvel Universe, and aiming to avenge the fact that he even exists to begin with. We see the result of this realization as it dawns on Professor Xavier, and it drives him into a catatonic state.
To Wade's (twistedly correct) mindset, he's not actually killing anyone, because none of his victims ever actually existed to begin with.
This story is the logical endpoint of Wade's capacity to see beyond the fourth wall, and how someone with his history would respond to the full realization that he is only a work of fiction.
It's very disappointing to see so many people completely miss the central point of this story.
Fans of the 90's Joe Kelly run will find a lot of the darkness they may have missed since the Daniel Way run began in 2008.