Warning: This contains many spoilers, so if you don't want the film spoilt, especially if you haven't seen the original, don't read on.
I am a long time fan of the original films and was not expecting this
remake to come anywhere near it, but I thought they actually did a good job with this remake. One of the things I loved about it was the in depth look at Damien/Kathy's relationship; the film focuses a lot more on that than the original does and makes it all the more creepy. I liked the way Kathy's death was handled, the way Damien kept the police guard transfixed while Mrs Baylock (not as good as the original - Billie Whitelaw I think, but had her moments and some of her facial expressions were chilling) went in and injected poison into one of the tubes attatched to Kathy.
The 'nightmare' scenes added a lot to the film and gave a better insight into Kathy's deteriorating mental health, due to Damien's effect on her. One or two were somewhat signposted, but there were also a few that made me jump!
Liev Schreiber, while no Gregory Peck, did a good job as Robert Thorn; I felt especially sorry for him in the climactic scene in the church at the end. Julia Stiles was very good as Kathy, although maybe a bit too young looking? Having said that, she appeared more mature and authorative than in her 'teen flicks', especially in the scene where she demands that Damien be dressed for Church immediately.
However, the use of music in this remake was poor, compared to the excellent original - the scenes just didn't hit the heights, due to the lack of music in some scenes.
The scene where Mrs Baylock fights Thorn was far too short and nowhere near as hard hitting as the original.
Overall, the original is better (I didn't like the Father Spilletto scene in the remake at all), but this is a decent remake. The montage of current events signifying the arrival of the AntiChrist at the beginning was very effective, as was the death of the Pope (?) at the end. I wonder if they'll remake the other two?