I don't tend to read a lot of books with blood and guts featuring in them, although like you, I've read a fair few WW1 stories and it's acceptable in those as it's true to life.
I don't tend to read horror books, so most of my reading is mild in terms of gore!
I find it hard to read. When I read A Child Called It I had to put the book down and take deep breaths on more than one occasion, and even in Mark Haddon's A Spot of Bother there was one part (anyone who has read the book will know what I mean!) where I found it difficult to read!
In answer to your question, yes, I think it's more acceptable in some books than others!