Quote from Spsiegel1987 »Dredge didn't have massive shares because people literally began packing 6 graveyard hate cards for it. In that process, it pushed out all graveyard decks in modern. I remember looking at the tier 2 status of modern, and tier looked slim with a lot of it being regulated to tier 3. The splash damage was too great. Affinity was too slow to deal with dredge and infect so it really retreated in shares as well. Meanwhile, Jund over prepared for it without having to worry about Affinity and had an ok game postboard because of the absurd amount of hate. Even Junk started to main Anafenza.
Dredge was a massive problem and so unhealthy for the format.
I think most Modern players would agree that Dredge needed to go. Strictly anecdotal, but even the people that were playing Dredge around my area were pretty quick to admit that the deck needed a ban.
I still dislike their reasoning for banning it. As Ktkenshin said, it’s an explanation that's wide open to interpretation.