Entering Hellfire Ramparts is indeed a nightmare, especially as a tank... Leveled up a Warrior not long ago with a friend who healed, the moment we got to Outland territory every single group had at least one death knight in them, often we had three Death Knight "DPS", who loved to run around in tank stance and use death grip.
Furthermore, I really don't want it to be gated at all. Monks weren't, why would Demon Hunters be, just because Death Knights were? I find Death Knights to be a huge mistake I hope Blizzard never repeats.