Richard Morgan's The Steel Remains is an interesting and well written fantasy book, but in my opinion it isn't an exceptionally good book, because it doesn't bring anything new to the fantasy genre.
Some people have said that this book contains lots of explicit sex and violence and that's why it's different from other fantasy books. This is true, but experienced fantasy readers have read about sex and violence before, so they're used to it. Readers who have read only basic epic fantasy may think this book is a bit shocking, but experienced readers will probably think it's just a normal modern fantasy book.
The Steel Remains is an enjoyable and entertaining fantasy book for adults, but it isn't a perfect book. It's worth reading, because the story is good and the characters are interesting, but it could be a bit better.