Rhine Main?
I'd think anyone would be hard pressed to compare something from 30+ years ago. However, it's quite possible to compare what you have on your trip to the same thing sold over here once you get back.
That's what ruined it for me anyway, taking the trip last summer and then having the same beer once I got back.
No, I was in downtown Frankfurt, in the Army at V Division HQ much of the time (G2). Some of the time I was in an S2, but still in Frankfurt. I rarely went out to Rhein Main, except for very occasional shopping at the huge PX. We had tons of restaurants, gasthauses, even the zoo downtown so I mostly stayed in the city and neighborhoods around me. I loved it so much!