Can someone explain to me why Slaughterhouse Five is a good book?

It's not, Reddit lied to you.

>>7981750
this

In the years since Slaughterhouse-Five was first published in 1969, it has become part of the world’s consciousness. The book explores fate, free will, and the illogical nature of human beings. Its sensibility is a direct descendant of that of Mark Twain, who, like Vonnegut, used humor to deal with the world’s horrors. Vonnegut was anti-war, anti-religion, anti-hypocrisy, anti-the-glamorizing-of-war, and was specifically opposed to the bombing of Dresden, a city which was not supposed to be bombed because of its art and architectural treasures. This was one of Vonnegut’s many paradoxes. Art was sufficient to protect a city from being bombed—but the loss of human life was not important enough. In fact, the destruction of people was the point and purpose of war.

>>7981748
It isn't.
Vonnegut is a hack loved by /r/books and 'edgy' highschool kids