84, 96, and 03 seem like the top three in the last 30 years. All those drafts have multiple hall of famer, arguably the best player of his era, and some ayers who made all star games.
1984 had Olajuwon Barkley Stockton, all hall of famers, and Jordan as the best of his era. It also had Alvin Robertson Otis Thorpe and Kevin Willis who were all stars.
1996 had Kobe as arguably the best of his era. Ray Allen Steve Nash and Allen iverson are all also sure fire hall of famers. This draft also had all stars in Big Z, JO, Marbury, Antoine walker, and peja. Marcus Camby was never an all star but was defensive player of the year.
2003 had Lebron as the best player of his era. Lebron, Carmelo, wade, and Bosh will all likely be in the hall of fame. This draft also had mo Williams, David west, josh Howard, and Chris kaman as players who made an all star team.
The 2014 draft is believed to be on par with this draft. If true then having a high lottery pick in this draft is pure gold.