No, I'm not against the USofA at all; they may be overweight, they may talk in very annoying accents (learnt from work experience), and they may be constantly criticized by the world basically because of the amount of power (both military and propaganda power) they have, but they have certainly helped us out in many occasions, and we will certainly help them out in many future occasions. When the WWIII goes "pop", we will certainly be on the US's side.
The US have gotten into a sticky position, and the UK have followed them right into the pie (...or peanut butter, or whatever). But we also have to think about Iraq...
In my opinion, we should retreat only when the Iraq forces think they can handle it by themselves.