Love them or hate them, Zep, the Stones, and the Beatles have the greatest catalogues in rock music and it’s not disputable.
As far as convincing OP to listen to them, I think that’s a waste of time. If you’ve already sampled them and it wasn’t to your liking, fine, move on to the next thing. Just because they helped build rock n roll and are all time greats doesn’t mean you have to like them. Enjoy what you want but please realize any case you want to make against them has no chance.