I wouldn't say JVC are bad at all.
Ive just been given a separates system by JVC from 1984 from a family member.
The amplifier is the A-K11. Which is still going mighty strong today, and is very very loud. Ill admit the 'equalizer' functions are a bit basic (treble + bass only), and as there is only 4 inputs (Phono, Tape Monitor, Tuner & AUX). Also the Power LED has its moments when it doesnt come on. Oh its 100% better than my previous system's amplifier which was a Pioneer all in one system from '93.
The tuner (T-K11L) is an old analogue one which does still work (although for some reason you need to turn the auto tune function off). All the LEDs and buttons work on that.
I was also given a turntable (L-A110)... but that seems to have gone wrong over the years of heavy use. The motor that spins the platter is really slow for some reason and makes all records play at like 15rpm.
Also a cassette deck (which im giving away to charity), which works nicely. These parts of the system look beautiful, as they are in silver and dont look very old at all.
It also came with the S-40 speakers, which well are just beautiful in my opinion. Again very loud, but the only problem i have is on one of the 'subwoofer' drivers is a small tear - from age im guessing.
I also have a late-90s JVC CRT television...which i picked up for a measly £18. 20" screen that hasn't discoloured in any way. Only thing i have a problem with it is that its a bit big and bulky. Its no superior television, even back in its day, but it still works for being almost a decade old.
Finally my mum has a "mini/micro" sytem that again is pretty powerful. Brought about 3 years ago for £120. Still going strong, although - it doesn't get used much.
[edit]
Oh i forgot to add, the only bad thing ive ever owned by JVC, are their gummy ear phones from about 4 years ago.... worst earphones for the price ever. Tinny, uncomfortable trash.