The 'Generations' game is under-rated. I think it was very much overlooked at the time, because its sprite-based 2.5d game engine was out of date at a time when the world was being introduced to Quake II
. The actual game itself is pretty solid (it's a very different type of game) and I reckon would have been more fondly recalled had it been released a year or two earlier than it actually was. And I loved the way it played with the established film plot, especially the alternative ending.