**SPOILERS**
I watched this about a month ago but never got around commenting on it.
First, I thought the movie was awesome. And I thought this even though the movie was spoiled for me. Some asshole (a regular) came up to me at the gym:
Asshole: Have you seen Shutter Island?
Me: No. Is it any good?
Asshole: Oh yeah! I don't want to spoil it for you, but have you seen 'The Secret Window'?
Me: Uhhm, yes..
Asshole: Well it's just like that!
Me: FFFFUUUUUUU-
I was pissed at the guy because I immediately came to the conclucion that DiCaprio's character must be insane. I was much more reluctant to watch the movie now.
WITH THAT SAID, and pretty much knowing how everything panned out, I watched it (DL), and still very much enjoyed it. The ending was more or less as I expected but there were so many other aspects of the film that kept me interested and had me guessing, that it was hard not to like. In regards to Shutter Island being predictable, I beg to differ. I basically knew the ending and by the way this movie was directed I actually doubted whether the guy had actually spoiled it for me.
The most powerful scene for me was when they did the flashback to when his wife killed their children. That shit blew my mind. There were other big scenes but that one was the best IMO.
As for the ending, I thought it was pretty straight-forward. He was insane, but the last measure to cure him of his illness worked.
"Which would be worse, to live as a monster or to die as a good man?"