Sorry but that depends on people. I've been a book lover since the age of six, but if you tell me the end of a book before i finish it, you almost kill the book for me. It will be hard for me to finish reading the book.
What i like in the book is to see things unravel one by one in a process that leads you from a starting situation till the unknown final situation. I like to ask myself "hmm this will probably ends like this", "will that character survives ? I'm not sure", or "can the character get out of this pinch ?". It doesn't need to be a major plot twist, it happens for every book from great classics to cheap moderns thrillers. Sure you have violent deaths, plot twists in any spy book, but you also have character/relationship evolutions in War and Peace.
If you tell me the final situation before hand, I won't care anymore about what happens, because I don't think "I'm at instant X with the main character, what happens next ?" anymore, I'm already at the final moment, instant X is past and no longer relevant.
That's also why i can't read the same book twice, or why i hate flashback books (Dark Tower IV, i'm looking at you).