"Featuring the likeness of the CSI crew"... yes.. that is apart from Sara Sidle and Catherine Willows. Two key characters. Normally it wouldn't be such a big deal but considering the gameplay in these games is normally quite limited, having the real voices has long been one of the only redeeming features. The Sara impression in particular is absolutely dire.
If you aren't a fan of the show, avoid this game at all costs. If you're a CSI fan on the other hand, well, whilst the graphics have improved compared to the previous 2 games, its slightly easier, particularly compared to the second CSI game, and the storylines aren't that interesting. Most of your time is spent now interviewing suspects/witnesses and it just doesn't feel very challenging at all. If you can get it cheap its worth buying as its like 5 bonus episodes of CSI but otherwise it might be worth avoiding!