Jazz has developed for over 100 years by now. If a game soundtrack is "jazzy", it's probably in the "easy listening" corner. But there aregwere hardcore musicians who tried to invent new things in the genre.
Imagine only ever playing 2D Mario games and someone shows you Dark Souls. Yeah, it's not really easy to get into when you haven't grown into the medium. But that doesn't mean both aren't valuable.