Halo is slow, unresponsive. I guess it\'s okay because the gameplay suits it fine.
TimeSplitters is better in this aspect in every way. It\'s fast, it\'s precise and it\'s a joy to play because you feel like you\'re there, being able to rotate extemely fast and aim where you want to, even using the analog controls.
Just compare MGS2 and 3 in first person mode. The difference there and it\'s very noticable. First person shooters as like racers should always be 60 Hz.