Rio is not an experienced captain.

Despite the fact that Christiano Ronaldo catches the eye and makes the headlines each week it is Rooney who is the talisman, inspiration and dynamo behind Man Utd’s success. He has been absent from the team each time United have lost a match this season. If the captain should be a player who leads by example then for his energy and determination alone he should get the vote. Add to this the fact that he is arguably the most talented English player and that he enjoys the respect and admiration of the rest of the England squad. If one is looking to appoint the England captain from the ranks of Man Utd then Rooney would be a more positive choice of captain than Rio.

As someone who has served a ban for missing a drugs test and also been involved in some less than savoury behaviour away from the football pitch Rio should not captain the side.
The role of captain is much more than as a leader on the pitch – indeed it is arguable that the choice of captain has little if any influence on the performance of a team during a match. The importance of the captain is more his ability in a PR role – to represent the team to the worlds media and to act as a liason between the players and the management away from the playing arena. Rio would be just as vocal an organiser of the defence and perform his duties for the team equally well whether he wore the arm band or not.

he missed a drugs test and was banned from playing football for a period of time.
he organised the Man united chrismas party that brought a whole host of bad pess including a rape alegation