I got got to meet and record Levon, Rick and Richard on several occasions during my college years at New Paltz. They were the house band at the Getaway Inn and often played at the Horsmen's Saloon, too. I also was able to record The Band a few times. Their music Is very dear to my heart and I cherish the times and memories. That being said, if judged by their live shows, they had great moments as well as some forgettable ones.
The issue here is that the Dead's catalog is 99 percent live. As I have already stated, f any bands worth, genius, or merit were only based on listening to their live concerts, I think you would be less impressed, or at least bored after a few concerts.
The Dead seldom bored anyone and impressed most. And, that is after thousands of live concerts. Most bands do the same show and play the same licks day in and day out until they have their 20 song concert down. The Dead had about 120 or more songs they could pull from on any given night and the playing for each song could vary in a small way or a very big way.