I'm gonna try and look at it in two ways: A book, and an adaptation of a computer game.
As a book, it's an okay story about a violent bloke who loves to kill people, who meets with a woman and learns (sort of) to control himself, while foiling the bad guys.
As an adaptation, it's very poor. It misses out MAJOR points: half the scenes are either missing or dealt with in a few lines, skipping major battles from the game (Daveron doesn't exist) and Sarevok doesn't kill Gorion, his hitmen do. Some characters are different, or even missing. Xan is a fighter (and a good one at that), Tranzig is also a fighter, and Imoen is not in it at all! (She's an important character, she should at least have made an appearance) Also, the main character is not true to Baldurs Gate either (the idea of Baldurs Gate the game being you start of helpless and vulnerable, with someone hunting you down)
In Athens favour, there are a few things he did get right (He hit the nail on the head with Montaron, Xzar, Jaheria and Khalid) and some of the extra scenes added to it. The character development could have been better though, or the romance with jaheria a little deeper than "She looks nice...oh, Khalid's conveniently been killed, time to make my move."
Overall I think it shouldn't have been published. Don't bother with it, and definately not if you're a Baldurs Gate fan. Play the game instead.