He's clearly not, his record proves that. I've said it from the start, the formation Argentina where playing did not suit Messi, he was playing for too deep, almost as a central midfielder in a 4-1-3-2. It didn't suit him or Argentina, and that's exactly why I predicted that a team like Spain would turn them over. It didn't get to that stage but Germany, a similar team, did the job.
One player can't win a tournament on his own, it just doesn't happen, despite what some people would have you believe. And he can and will be compared to Maradona, he's one of the best players to ever play the game, whether he's the best or not is simply down to opinion.
The Champions League is a higher level than this World cup, Messi's performances where there for everyone to see when they won it, and he scored in the final.