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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Agreed. Gaul was ugly and boring as hell. Nokris and Xur where both boring. Panoptes may not be the coolest looking boss, but he had a cool mechanic and interesting look.