The most brutal, honest and grotesque account of what actual combat was like on one of the most disgustingly violent battles the world has ever seen. I highly highly recommend this book. It's probably the best anti war text I have ever read, just went the realities of battles are detailed in such a matter of fact way. Granted it was written retrospectively, but it is considered an accurate account. I've read the recently released Russian sniper on eastern front book, and Zaitsev's book, but this one trumps them all.
Also it is interesting to note, there were a lot of fake books circulting just after the war. For example:
I always considered this one of the defining combat books as well, but was disappointed when I did some research and it's is regarded by many academics to be a total fake.
Other truly excellent books, anythnig by Antony Bevoir is amazingly researched, and a good balance between every dimension of the battles he focuses on, political, economic and human. Stalingrad is my favorite:
Berlin is also an excellent one.
This book by Biedermann is fascinating, but some people might find it dry:
It portrays a lot of the feeling of front line troops very well, the pointless tragedy of it all, his poetry and romanticism is really interesting, but it is quite a dry book.
Anything by Primo Levi is also superb, he was a hollocaust survivor. Probably the most articulate and intelligent writing I have ever read on it.
Treblinka is an astonishing account of an uprising in a holocaust camp as well, I highly recommend this book, but it is deeply disturbing reading (as you would probably expect).
This book about Zhukov is excellent, but very heavy reading and it's overly strategic which always loses me, but netherless an interesting read on the greatest ww2 General.
This is a gem of a book as well:
The often unknown war between Russia and Finland, detailing extrodinary resistance and acts of bravery against overwhelming odds. Truly amazing book.
Also highly recommend this book:
The brutal account, comparably disturbing as the holocaust, when the Japanese went into the city and destroyed it.
Anyway those are just the best from the ones I've read imo