I am an old timer and have been working in photography since 1975. There have been a few real disappointments. The change in Portriga Rapid and the loss of Agfa 25 sheet film were the worst for me. But I don't see how you can complain about the quality of ACROS or the TMax films and there certainly has never been anything like Delta 3200 in 120. Currently printing on Oriental WT processed in glycin, I am almost as happy as I used to be with Portriga and Amidol.
I do remember well a time in the mid 80s when I ordered something like 800 sheets of Oriental Seagul glossy VC RC because it was great for commercial use and the large quantity of paper showed up completely different except for the box and name. It was complete crap incapable of a real black.