I think the 12 Kentucky team was extremely good, even by historical standards. They were the best offensive team in the country (only Louisville slowed them down) and could lock down on defense when they wanted to. Sure they were under classmen for the most part, but they were all incredibly mature. Say what you want about Calipari, but I don't know too many coaches in the country who can take a group of extremly talented freshman-most of whom probably had big egos-and get them to play that well together. Any one of six players could beat you, and any one of six players could get their own shot.
If Kentucky had one weakness, it was their lack of a killer instinct. They would get up double digits and then let the opposition crawl back into it. If they wanted to, they probably could have beaten Kansas by 25. Put them up against any historical team, and they might not win, but it would be a great game.
The best teams I've seen over the last ten years are 04 UConn, 07 Florida, 09 UNC, and 12 Kentucky. I couldn't really tell you who was the best of the bunch, but all of them were really, really good. I don't think anybody else's best game could stay within ten points of their best game.