I thought this was a great action score, it worked extremely well in the film. Not quite a masterpiece, but a throughly enjoyable listen - I enjoyed the film more because of it!
I had read a review before seeing the film that said the biggest flaw was Silvestri's score and that the huge orchestral music merely "sat on top the action" and was not suited to Jolie's character at all. My heart sank, and so one of the reasons I think I liked the film more than I thought I would was because of the score, as it was much much better than I had anticipated.
My only gripe is some of the cues are missing, in particular my favourite one which was used in the lab sequence with the electric guitar samples I love that cue and it's just my luck that it wasn't included on the album. Grrr! Roll on the bootleg edition