Descent 3 was not perfect by any means, but it was still a triumph in many ways. On a technical level, it stood out from the crowd back in its day. The story elements that made Descent 1 and 2 so good were carried on fairly well. The gameplay got a tad more complex and drawn out, and depending on your preference, this could be counted as bad or good.
If there's anything negative to say about D3, it's that all the spit and polish they applied to this classic series made it a little too bright and shiny. The dark tunnels and gripping fear of being hunted by heartless machines was somewhat sacrificed in this installment to make way for shiny industrial backdrops and full motion video clips chock full of cartoony characters.
However, is it worth $5.99? A resounding YES. This should be in every gamers classic library.