I'm in the loved it camp too. I thought this was excellent, absolutely riveting, I wasn't bored for a single minute. A genuine sense of dread through the whole thing, it was definitely 'creepy' right from the beginning.
I knew about Swinton's multiple roles, but my wife didn't and never even guessed, and I found it easy to forget the make up after a short while - she is just that good.
I know a lot of people seem to like the original, but I always found that too cheesy and very simplistic. I definitely don't consider it a 'sacred text' like The Exorcist or Psycho, where it is impossible to consider any remake being possible to top the original. This one does what a good remake should and the director uses the original as an inspiration, but definitely makes his own movie which doesn't attempt to replace the original and stands on it's own.
9/10 for me, one of the best movies I have seen for a long time.