It's been my experience that Alan Silvestri either gravitates to gung-ho action films, or modest comedies that require a light scoring hand. Forrest Gump is, obviously, one of the later, and perhaps Silvestri's best in that category, however the continuity of the album is not nearly as rounded and sustained as it could be.
Perhaps the greatest hindrance to this otherwise admirable score are the track lengths. Only one track is longer than three minutes, and that is an uninspired "suite" that does NOT include the main theme, but does manage to tack on some material that doesn't involve the rest of the score.
The Main/innocence theme is pretty, and where it recurs is appropriate and suitable, but take in mind that this doesn't happen often. The score is dominated by more emotional cues that are considerably less exciting and less entertaining. Prehaps the highlight of the score is the most upbeat and invogorating of the several themes, best exemplified in the The Crimson Gump track.
All in all, the score worked great in the film and there is a lot of good music to be listened to on the album, however poor packaging, poor selection, and an orchestra that sounded to me to be somewhat out of tune ruins this otherwise excellent CD. It won't hurt the listener to get Silvestri's compilation album of Cast Away to get as much material from Gump as necessary, as well as exposure to some of his other, better material from film's past.