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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The LORE behind Panoptes was cool and interesting. That goes for most other underrated bosses in this game. But Panoptes wasn’t a boss, it was set-piece. The only times it is directly interacting with the player is when you shoot it in the face. Bungie could’ve turned the mission into a fight to disable the Infinite Forest itself by shooting some Vex power cores or something instead of Panoptes and no one would care. Summoning adds and applying a DoT to players aren’t boss mechanics, those are gameplay elements layered over a building-sized enemy waving his arms around to signal when those things happen.