So there’s really effectively two different albums here. One is the oldies featured in the game (The Ink Spots, Billie Holiday, etc.) and the other is a score by Inon Zur. The link above for a sample is only for some of the oldies, it doesn’t have of Inon Zur’s score.
If you aren’t familiar with the game, the music is popular ballads from the era of the 1930’s -40’s. Its the kind of music that you would hear in Carnivale or Boardwalk Empire. Obviously this isn’t ideal music for most games, but if you are running a certain type of game, for instance a Call of Cthulhu set in the early to mid 1900’s then this music would really give the game an aura of authenticity and really help the players feel transported in time.
Inon Zur’s score is basically battle tracks, which are good, but there’s only a few of them and they aren’t “must haves”. (He also scored Dragon Age – Origins which had more variety of themes and moods). Overall I’d say that you can pass on this, unless you are running a game set in the early to mid 1900’s (but even then you must just want to Youtube hits from a certain decade – for example Hit Parade 1930).