I'd have to dispute that many bands were much more ground breaking than The Beatles. The Sixties was a decade of continuous musical innovation, but The Beatles were continuously ground breaking and that's the difference. Every single and every album was different and eagerly anticipated because you never knew where they would go next. Having lived through that momentous decade and listened to as much music as I could, I cannot describe the thrill and the buzz of anticipation for every scrap of new Beatles music and they never failed to deliver, year in and year out. The Doors, Beach Boys, Kinks, Stones, Dylan to name but a few, were all wonderful but, unlike The Beatles, they lacked consistency in their groundbreaking. A great decade for a music loving kid to grow up.
I am not saying that just because I don't like them much they aren't great. Taste is personal. I am just amazed that anyone can say they are the most 'underrated' band ever. I was then goaded by my disdain for that post into having a poke. The thread is about underrated bands and, as I illustrated, they are far from that.
Legendaty Pink Dots, anyone?