The Tattooist of Auschwitz

I lent this book from a friend who really liked it so I tried finishing it (and probably could've, but I was so busy with packing so I just...didn't finish it. I could've, definitely could've, but by then I just didn't have the motivation to finish it. 
I understand that the book is set in extremely sad and really bad times - I know, I studied history in high school, I know all that. But I had no interest in the characters? They were...boring? Is that rude to say of characters in a concentration camps? Probably. Definitely. 
I read that it was originally a script and you could definitely tell that, because it was very dialogue-centered, but even the dialogue wasn't enough to want me to keep reading.

And the way they did all the transition scenes (so many) was too fast to gauge a good understanding of everything.