I have played in UK, Holland, USA and Spain at high amatuer/semi pro levels.

BASED ON MY EXPERIENCES I would rank the skill levels of the teams I played for and against as such:

1: Spain
2: USA
Not much to choose between them, although it was practically forbidden to question the referee's decision in USA.

3: UK/Holland - Very much on par, a lot more physical and less technical style of play.

Much of this has to do with mud. Seriously, the pitches in Spain were immaculate and in the USA they were all weather surfaces. UK and Holland were a slide tacklers dream, but not conducive to attractive football.

Please note that these are my personal experiences at a certain level and by no means a generalisation of any of these great countries footballing abilities.