Lord no, there isn't a world where these sound good. Though, it depends on what you think sounds good 😉
They're cheap and do make a sound - you can make something similar by wiring up and ol' piezo (from a buzzer/ringer/etc) to a jack. I've make some basic footdrum stompbox's - it works.
Overall...I'd go for a guitar that already has a pickup installed (factory or a reputable installer). If sentiment is a thing and you really want to use that specific guitar then installing is a option - though you'll never get your money back - hence the attraction of a soundhole style pickup, a no fuss reversible mod.
For me, most acoustics sound best with a duet/blend system - a undersaddle piezo + insternal; mic - that could be blended to taste. But that be a pricey aftermarket install.
