Being better than the likes of Matri, Quag and Bendtner is hardly much of an achievement.
The thing about Vucinic is, he really is massively talented, on his day he does border on being world class. However, he rarely plays to his full ability, when he does, few forwards are as good as him. His inconsistency would be very frustrating to me if i were a Juve fan. That being said, when i say he's inconsistent, that does not mean he's poor most of the time. It just means that he doesn't play at the same level week in week out.
Not sure what Vermalen has to do with any of this, but if you want my opinion on him, I don't think he's world class at all. He's a strong, fast defender thats good with the ball at his feet, and a very good one on one defender. However, he has too many lapses of concentration, makes too many mistakes, his positioning is not all that, and his general IQ as a defender isn't that high imo. I wouldn't consider him close to the top three defenders in the EPL, wouldn't even consider him in the top five(even though its debatable).