Is Mephisto broken?

I just used Mephisto in arena against Voodoo and his soul imprisonment did not stop Voodoo’s regen buff at the beginning of the fight. I wasn’t able to test special 1 since my MD boosted my power meter up too quickly to test it. Please look into this since his ability to stop buffs at the beginning of fights and use of special 1 is one of his best features.
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This is a case where being duped doesn't help:
Unawakened Doc Ock inflicts heal block, which does stop Mephisto healing.
Awakened Doc Ock no longer inflicts heal block, but attempts to do damage equal to the healing. As Mephisto is supposed to be immune to damage whilst healing, this ability will (predictably) not work.
Heal blocking with Civil Warrior usually works for me. However, I've observed two other issues with Mephisto's healing in the arenas:
1 - fought him with Vision AoU. Vision's SP2 did seem to inflict both damage and Heal Block during Mephisto's healing. Maybe the direct damage bypasses Mephisto's ability, as it does Safeguard. Probably working as intended.
2 - fought him with Nebula (and level three Despair). Had nine shock charges on him, and still observed healing despite the fact that seven stacks of Despair ought to reduce his healing by 105%. Is despair broken?
Regarding your first point it seems vision’s special attack damage is independent of other special attack damage which is why it bypasses safeguard and is not affected by power shield
I don’t think despair is broken but instead I think that his regen is a passive (like deadpool’s sig) and is not after by depair and can only be interrupted by heal block
This is a case where being duped doesn't help:
Unawakened Doc Ock inflicts heal block, which does stop Mephisto healing.
Awakened Doc Ock no longer inflicts heal block, but attempts to do damage equal to the healing. As Mephisto is supposed to be immune to damage whilst healing, this ability will (predictably) not work.
Heal blocking with Civil Warrior usually works for me. However, I've observed two other issues with Mephisto's healing in the arenas:
1 - fought him with Vision AoU. Vision's SP2 did seem to inflict both damage and Heal Block during Mephisto's healing. Maybe the direct damage bypasses Mephisto's ability, as it does Safeguard. Probably working as intended.
2 - fought him with Nebula (and level three Despair). Had seven shock charges on him, and still observed low-level healing despite the fact that seven stacks of Despair ought to reduce his healing by 105%.
Interesting. There's nothing in the Despair description to suggest it works on some forms of healing and not others. I'm pretty sure I've reduced Green Goblin's passive healing by Stunning him; although that could be Pacify working rather than Despair.
It would be nice to get some comment for clarity from a mod, if one happened to be passing.