Here are my thoughts on your Big Men.
Brooke Lopez would be nice. From watching Stanford, he was always in the paint on offense and didn't wander too far unless he was setting a pick. Also, he looks to be a threat on Offense every play. He can really get up and down the court as well! He doesn't leave the paint on defense either, and does intimidate ... But at Stanford, he and his brother covered for each other a lot.
Kevin Love is awesome, but he's a bit undersized for the Nets needs in the middle. The Nets need a legit scoring threat down low ... Love will be good in the pros, but he seems more like a PF that plays away from the basket than around the basket on offense. On D, KLove is a lot better than he got credit for.
Jordan and Mcgee ... I didn't get to see a lot of.
Robin Lopez is more passive than his brother on Offense, but more aggressive on Defense. He needs some sort of an Offensive game/mindset before going to the NBA ... I think he'll be back at Stanford next year.
Koufos ... Nenad Kristic lite. A jump shooter with good range and decent passing skills, but has no idea that he's 7 ft. tall on Offense or Defense.
Roy Hibbert ... How far you have fallen. He's a legit 7'2 and is great on Offense despite being mechanical looking. He's not too athletic, but at 7'2 do you need to be? He can pass, score in the paint with hooks, post up moves and runners. And he obviously has a high BBall IQ. He seems to fade away on Defense at times and didn't demand the ball on offense. I think he would get lost on the bench with the Nets.
Hardin ... Buyer beware. Injuries galore!
Hasheen Thabeet really picked it up this year at UConn. He's definitely a factor on the defensive end, but his offense is pretty limited. He could use another season to work on some offensive moves.