You kill a T-Rex with a knife! What more could you want?
On the plus side, you kill dinos with a knife. It doesn't sound THAT exciting, but killing raptors and the like with your trusty combat knife is down-right awesome and it is such an achievement to take down a T-Rex with it. The only problem with the knife is that sometimes you miss the dinosaurs with it. You have to pull RT at the right time but due to them being so swift you end up swinging like Norman Bates! And if you're getting shot by a guy who's seen you and you want to kill him with a knife: you're buggered because when you get shot, it slows you down so you basically get stuck on the spot whilst swinging your knife 20 feet away from his face!
Multiplayer is very fun if you can find the right people to play with. The knife fights I had with these bunch of guys was hilarious!
Overall, Turok is a solid game which deserves a good score of 8. Try the demo first as some people see it as mediocre shooter and nothing more than that but I really enjoyed the game.
If Jurassic Park taught you stay still when you come across a T-Rex - forget it. You'll get eaten, believe me. Although it is funny. Sorry, Turok.