I`m running XP on bootcamp works fine ,there are very limited games for mac plus I don`t have to throw away all my old pc games ,having said that not all pc games will work have had some probs (but that may just be my inexperience not knowing my way around)getting some to work properly .
I run AVG free and yet to have any spyware/virus issue.
Plus the one time the mac went belly up on me I could still access windows and get online to sort out the problem. So I`m definitely a fan of bootcamp.

Most games come out on pc 1st and for mac months later.