Falc. Robinson is the best English GK, which sounds quite impressive, until you remember that David James is his deputy
He (Robinson) is a good shot-stopper and a solid GK, but nothing more than that. I would think he won't be among the best keepers in the world cup. I would rate several goalkeepers in the tournament a lot higher than I'd rate him.
The defence on paper should be one of the best, but I have a feeling it won't work out like that. Rio Ferdinand is prone to lapses in concentration and Sol Campbell has definitely declined as he's passed the age of 30, and he is probably the least comfortable on the ball out of all the England defenders.
John Terry is the only centre-back who I have full confidence in. I also like Carragher, who has improved immensely over the past 2-3 years, but I don't think he'll play in that position if he starts any games. I expect it will be Terry and Rio to start, but I'd go with Terry and Carragher on current form.
As for the full-backs, Neville should be dependable enough; Cole used to be a bit careless but he's good going forward and seems to be able to defend properly nowadays.