Sneijder had a pretty average season when it comes to Serie A. He was shining in the CL.
This is true, even Alen would admit to this. However, i'd say he was quite good in the Serie A, just not world class. Still he was world class in the CL and he was amazing in the World Cup, so that has to count for something, he was a big game player. The problem with Ronaldo was he was the complete opposite, he had a poor world cup, had two poor classico's, and was poor when it mattered in the CL, in the other 30 games he played in that year he was better than all players barring Messi. Personally i wouldn't have put Iniesta at all in the top four, Ronaldo and Sneider had much better years than Iniesta, who was absent for 50% of the year, and even when he was around Xavi and Messi were more instrumental for Barca than he was. What he has going for him is an amazing world cup.
Moving to Xavi and Messi, Messi was Barca's best player scoring a shit load of goals and assisting so many others, he had two very good classico's and he destroyed Arsenal in the CL. But he played two very poor games against Inter, and in the World cup had a few good games, but played bad when it mattered(Greece and Germany). Xavi was very effective for Barcelona and he was very good in the world cup. The only thing he's got going against him, is the two Inter games, to be honest, i think he is the most deserving this season of the best player award, its a tough call though, and i would say Messi comes second. I'd give Ronaldo third, and Sneider fourth.