A Villa fan here..
It's a sad day for us to see Mellberg play his last game at Villa Park, he's been a solid defender in his time with us. He's been forced to play at RB the majority of this season, mainly because we don't have a recognised RB in our squad, but he's done a very good job.
What you're getting is a very commited player who IS good enough to play in the Champions League - at least in my opinion, he is good in the air and his tackles are usually timed very well. His only downside is that he can't cross a ball, at all. But if he's going to play at CB for you, then I guess it's not a problem!
He's loved at our club and it's a sad day to see him go, but he got a fantastic send off today! I wish him, and Juventus, the best of luck!