Panoptes was a really cool boss that had the misfortune of being in an underwhelming DLC. His design was awesome and intimidating, and the fight was very cool thematically. People often ask for "single player raids". Panoptes was a single player raid boss. Add one or two more mechanics and he'd fit in with any other raid boss.
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I liked Pantoptes, but I never cared for Osiris and Brother Vance at all. So that whole DLC story (what was there) was largely ignored by me. I don't even know the lore or anything behind Panoptes, and despite doing the campaign on all my characters, then helping my buds through it as well, I couldn't tell you much about what happened in CoO other than waking up Sagira.