If you played it twenty years ago, odds are you remember it being solid and interesting. It still is. It isn't much like the original, but that also isn't the point of the experience. Try it out and enjoy the impossible attempt to make a sequel to one of the most original and respected works in gaming.
People were given the expectation that this would be something like Planescape: Torment, but that is a creation and an experience that can happen only once. Taken on its own terms, this is a great game, full of heart and obvious craftsmanship. You will only be disappointed if you go in expecting a recreation of what you saw in 1999.