The reason why you would like to buy buy it is the level editor. The Next Generation will be a game what is reallly different from the previous ones. Gameplay is same as ever. The level design is good and game is easiest in TR series, what is the main problem of the game. You will complete it too quickly.
Graphics engine is the same as it was in The Last Revelation.
But the graphics look much worse, the textures are bad and characters look very blocky. The sky looks even worse it was in TR 2. And there are still the same old clipping problems. The good thing is that TRC runs very good in older computers. Sound is as t was 2 years ago.