For serious dinosaur-bashing, this might be a better bet than Trespasser, and it will be available on PC soon. This is one of the first Nintendo games to make use of the expansion pak, but even without it, the graphics are excellent.
Controlling the character can be awkward at first, but after a while, becomes second nature. There are two modes of game-play. "Quest" is the excellent single-player mode, but up to four can join in with multi-player "Blood Lust" or "Frag Tag" modes.
Turok 2 is one of those Nintendo games that is almost a requirement for those whose only gaming platform is the N64. Although is not in the league of Zelda or Goldeneye, it gets closer than most.