Perhaps the reason why the UK trained pilots are considered "better" is for a simple reason. They have been over trained. In the UK you are lucky to get 1 flight a week but more than likely 1 every 2-3 weeks. So next lesson you spend half of it going over what you learnt before as you have forgotten it. End result is the 45 hours is no longer a legal requirement but a target with most schools going over this. I did my IMC a few years back and they were more than happy to tell me over a few pints that their students on average took 55-60 hours to get through and that they didn't feel that the 45 hours was enough to train them. Well that will be news to the CAA then.
The best form of training includes continuity and unfortunately you just can't get that here in the UK unless you are very lucky and have a school committed to pushing you through during summer and bending over backwards. This hardly ever happens.
Being frank no planes that I am aware of are falling out of the sky as people have been trained in the US. So long as they are legal and safe then who really cares if they lose a bit of height here and are off heading there. It all takes practice and you can't expect much from someone with such few hours under their belts.