I dig Simon & Garfunkel too but they're not 70's but 60's. Their last album was released in 1970 but recorded in '69. But BTW check out the Paul Simon stuff from the 70's.
Their engineers and sometimes producer Roy Halee was a genius IMO - amazing sounds. There's something about the sound of 60's and 70's CBS recordings; S&G, John Cale, United States of America, Paul Simon solo, Bob Dylan, etc.
They had a number of identical studios all over the US which kindda explained the similarities in sound. They sounded dry, yet full and warm.
I got a thing about not liking mixing styles of the 90's - with some notable exceptions like Brian Jonestown Massacre and Pavement. The thing annoying me about many 90's records was the ideal of using no reverb and getting clarity at all costs. There's a fine line between clarity and harshness- Placebo comes to mind here. Could have been great, but I get a headache from listening to all that treble.
I still consider making my own re-masters of Sonic Youth's "Dirty" and some of the American recordings by Johnny Cash to get a less trebly, fuller sound on these great records.
To me DMB is rather boring in every aspect but whatever floats your boat.