What I have found is some sound amazingly good, some not so much vs their CD, or vinyl counterpart. After time, (maybe some never did), I don’t think the record companies put enough effort into creating good mastering and playback quality on cassette tape vs their vinyl or CD counterpart, but some did, and those indeed shine.
I have figured out a way to record as well (without a tape-out), so have erased many of my good quality metal and chrome tapes to play around with that, many times with very good results. But I also found quite a few had mold from being boxed in my basements or outdoor storage units over the years, and that made them useless. And the cost off a good quality blank tape is ridiculous today, as you have to basically buy old new stock, or a bunch of pre-recorded ‘blank’ tapes off of someone unloading them, and they charge a pretty penny as they know there is really no supply for new good quality tapes.
All that said, I’m glad I have the Nakamichi and my old tapes to play, and and quite surprised just how good some of them sound.