As a devoted Vault listener and poster of feedback, a person who attended a number of these concerts at Fillmore, Winterland, and Fillmore West, and having strong auditory opinions, I offer my "Best and Worst of the Vault" up to this point (abridged to save space):
Best Recording (pre-1970): Jeff Beck Group with Rod Stewart
Worst Recording: The Electric Flag
Biggest Revelation: Steppenwolf
Most Overplayed: Tie: Elvin Bishop and Bob Dylan
Worst Live Group: Crosby, Stills, Nash, and Young
Most Missed: Tie: Velvet Underground and Buddy Guy
Most self-indulgent jam: Allman Brothers (Honorable Mention: Led Zeppelin)
Best Jammin': Ten Years After