Normal was a good and fair challenge for most of the UC games. I think UC4 was the toughest and UC2 the easiest. I liked UC2 but I still think UC1 was my favourite despite the first half getting repetitive with waves of enemies. UC2 was TOO linear in the first half for me with small areas although it was more varied and the second half was great. UC3 easily the worst of the series for me.