Re: Are all ceramic magnets bad sounding?
When you ask about "good and bad", it's all opinion, and that's influenced by the PU itself, the guitar, amp, and type of music. You're not going to get a lot of hard facts starting a thread like that.
Being a Chicago blues/classic rock player, I prefer the warm & character of alnicos. I haven't liked ceramics in my PU's as they are too bright for my tastes, even with 250K's (I like warm bridges). Of the ceramics I've tried, Gibson's 500T is by far my favorite; it's grainy quality flavors the tone and gives it more texture. You'd get the same thing from a 498T with a ceramic.
Ceramics can probably work in any kind of music, as can alnicos. All depends on the player & his rig.