My review probably isn't going to add a whole lot because quite honestly this is a RARE case where I actually agree with just about EVERYONE else in what they have said in their Summaries about this film...
Basically, I suppose I just wanted to add my general agreement with most people here that the film is not terrible at all. The mood and look of the film is nice, the acting and direction are decent, and there are a FEW scary moments, but ultimately, I just don't think that it has enough depth and substance to make it a very effective Horror film. I guess I AM a bit of a sucker for Haunted Children stories, but there are two other films similar to this one that I personally like a ***LOT*** better and I wanted to come here and mention them because they have a very similar theme, but I feel are far better movies.
'THE ORPHANAGE' (2007) An exquisitely moody Spanish film by one of Guillermo Del Toro's protégés.
'THE AWAKENING' (2011) A very effective British Period Horror film about a Haunted Hospital starring Rebecca Hall. I think that I rated them both 9/10
So, FWIW, I thought that if the premise of this film caught your interest, I really wanted to be sure to tell you about these two other films which I feel are amongst the best of this Genre. I highly recommend them!
About this movie... Basically, the technical aspects are just fine. The acting and direction are good. I feel that the director did moderately well in creating a fairly decent mood. But, I think that maybe the story itself and perhaps the way it was developed could have used a bit more complexity and depth. Otherwise, it is a pretty much just a passably mild, 'Haunted Children' Horror film. And Stephen Rea is all but wasted in his role, really.
I actually gave this a '5' which is a little higher than it's current 4.x, for what it's worth...
P.S: BTW, I haven't seen it yet (although I've bloody HAD the film for like 3 years) but the Spanish made, English speaking movie 'FRAGILE' (2005) starring Calista Flockhart, also about a Haunted children's Hospital, looks pretty damn good...