The first time I listened to it I wasn't sure how well it would work. It sounded to me a little too much like Giacchino's other work on Lost, MoH, M:I:3 etc.
That said, listening to it more it did grow on me, with my favourite cue being "Hella Bar Talk" and "Nero Sighted".
Now that I've seen the film I feel it complimented it well. It's not a superb or outstanding score but very satisfactory and suitable for the film itself.