I want to say I played it about three years ago, first-time playthrough.
First of all, say what you will but I find N64 graphics to be charming. They’re repetitive and blurry, but incredibly smooth. The Kex Engine port by NDS and Kaiser just kind of preserves the original look and feel as much as possible.
The game is at times more like a 3D platformer than a shooter, and the 3rd stage has aged badly with its endless pillars of jumping… but I had a great time playing the game, much less so with Turok 2. It encourages you to explore every inch of the levels and find new things in them, and I had a fantastic time playing it to the end. The bossfights ain’t a slouch either.
There is a modding community on Steam and some people have done some pretty neat-o things, not sure if it’ll be enough to keep you interested though.