Why do piezo pickups sound bad?
piezo systems suffer from installation problems that result in less-than-ideal sound. ... The downside of undersaddle pickups is that they tend to have a very strong, spiky transient attack, which can make the guitar sound harsh or unappealing, especially when played with a heavy right hand.
How do I stop my electric guitar from making noise?
Single coil pickups are naturally a little noisy. Just like active electronics, the simple solution is to remove the troubling noise/frequencies with an equalizer. Another option is to use a noise gate pedal that will automatically mute your guitar when you are not playing.