Not one of the more active 5.1 soundtracks out there, but I thought the overall surround effect was pretty good and had pretty good imaging. If your only evaluation criteria is the sound effects activity and volume on the explosions, then I would say it does fall a bit short of other action pics. At one point in the movie, the cannon battle sounded light on the bass, and I did recheck the LFE level and my subwoofer output level to make sure it was the soundtrack and not my system setup.

But, IMO a lot of movie soundtracks mix the bass way too high (LOTR:FOTR is the most glaring example) to the point that they detract from everything else going on in the soundtrack. To me, a movie soundtrack should help pull the viewer into the movie and engage them. But, going overboard with the bass and surround activity just makes me want to tune out, and that makes me less involved in the movie and I wind up paying more attention to the sound than the movie itself. Personally, I would rather have the soundtrack a little bit lean on the bass if they did everything else right, rather than a soundtrack that cooks the bass so high that it takes away from the enjoyment of the movie itself (the original DD soundtrack for LOTR:FOTR had the levels so high that I can detect distortion in some channels).