Thanks for making a thread on this. Sneijder is talented and does have some qualities about him, obviously a technical player with very good shooting abilities, accurate and powerful striking and is exceptionally well from the dead ball situation. His best season came in 2006-2007 he scored 20 goals in 43 appearances with a 46% gs.
He has been plagued by inconsistency and injuries in the past but I think he is doing well at Inter, has a decent amount of assists and goals so far and he isn't afraid to have a go at goal from distance making use of his shooting abilities.I don't know about rating him above Xavi, they have their similarities, both are really good with keeping fluency through possession, they are both the playmakers in their teams. They can thread deadly through and ranged balls complimenting their creativity and vision.
For me Sneijder is more versatile but both are indispensable to their teams, Xavi is revered at Barca and Sneijder is without doubt Inters most creative player. As for Iniesta, that is a good comparison, they are both attacking/left sided players.