Now I like Messi alot. But if you are going to compare him to Rooney or Ronaldo then at least put it in context.
If you have Messi in the United team, imagine each game when he is man marked or double marked, how would he cope then? It is easily forgotten that he just played against Madrid who's defence is embarassing at best. The amount of space and time he had was laughable.
Neither Rooney or Ronaldo get the time or space that Messi does, the defending in the Premiership is of a far higher quality then that of La Liga. Would Messi be able to cope with kind of tackles that Ronaldo gets each game? Would he be able to challenge against the opposition like Ronaldo does?
Also he has already shown in his short career that he can't handle injuries too well. Messi when he is on form looks brilliant, but that is also down to the team he plays with. With playmakers like Ronaldinho, Iniesta, Xavi and Deco then the kind of support he is going to get will play a major part in his performance.
You put Ronaldo or Rooney in that team tonight and I can assure you that you would of seen a similar or better performance. Ronaldo out there today would have been devestating. His pace and skill on the ball would have torn Madrid new holes.