From their club to their country

Why is that when you think of Steven Gerrard in a red Liverpool shirt, you think he's on of the best midfielders in the world? But put him in an England shirt and the whole view changes. The same goes with many English players who perform week in week out for their clubs but as soon as England rolls up, their form disappears.
Frank Lampard is a classic case, his form for Chelsea over the last six years has been extraordinary, sometimes hitting 20 goals a season, many outside the box i might add. He's up and down the pitch more times than a yo yo, putting the effort in that all fans want their players to out in for the club. However, Lampard has been continuously criticised for his performances for England. Lampard can put the ball in the net from 25 yards for chelsea no problem, but for England it's not even on target. In the 2006 FIFA World Cup, Lampard had the most shots off target in the competition. Subsequently he has been subject to boos from some England fans, i feel this is wrong as how can booing a player make them better?
Many people will disagree with me on this but i feel Wayne Rooney has seriously underperformed for England. When he first played for England, he couldn't stop scoring and terrified teams in the 2004 Euro Championships. But since then he has scored only about 4 or 5 goals for England in 4 and a half years. Is that world class?
Steven Gerrard is a player that is the heart and soul of Liverpool football club, mention Liverpool and he is the first name that comes to mind. He has saved that goal and won them so many games with last minute goals and world class performances but his England performances are also questionable. I am not saying he vastly under performs but compared to his performances for Liverpool there is a huge differences between the red and the white.
The question remains as to why these world class players can't turn it on for their country, is it because they prefer to play for their club then the country, no i don't think so. I do feel it is down to how different in style they play for their club then their country. For example, Gerrard has the license to do what he likes on the pitch as he has two defensive midfielders there to protect the defence for him. For England he does not and so has to be more cautious and not focus on what he does best. England have the problem of having world class players that play in the same position and are forced to choose between them, like Lampard and Gerrard. For some reason they both can't play together in the centre of midfield, this is because they both like to move forward which would leave the centre of the pitch exposed.
If someone can answer the riddle of how to get these players to put in the performances they do for the clubs for their country they'll be a very rich person. If Gerrard, Lampard, Rooney etc, played for England like they do for their clubs then England wouldn't be waiting very long for a major tournament trophy at all.