Mostly agree with your rankings; with the optimism bias from being a cardinals fan personally, I'd argue you could make a 1 star increase at each position, but their current rankings are also fair. I very much disagree with the 1 star ranking at special teams however, as we have a pro bowl gunner in Justin Bethel being joined by some high upside athletes in the kick coverage team and kick return game. Probably the best coverage unit in the game, which coupled with a punter who is below average (don't think he's as bad as stats show- his hangtime is rediculous, and it seems the staff went with him for this reason. I'd choose a distance leg with our coverage team, butI digress). In short, I'd say 3 stars is fair. A perfectly average special teams unit, whose only limitation really seems to be Drew Butler's distance and the uncertainty of a new long snapper (but both seem pretty reliable this far)
Most of his baskets come off dunks or easy lay-ups
Left hand/ball handling
Summary: It is easy to see the intrigue surrounding Jonas Valanciunas in this weak draft. He recently turned 19 years old and has great upside to complement his God-given size. Valanciunas plays extremely hard, and if that work ethic continues throughout his NBA career, the potential is there for him to be a very solid big man.
Player Comparison: Andris Biedrins. Due to his rebounding and activity on the defensive end, Valanciunas falls somewhere between Darko and Andris Biedrins for me right now. Both players are limited on the offensive end, and until Valanciunas can develop any resemblence of a game outside of five feet from the hoop, that comparison appears to be pretty safe.