I was an Arachnos Soldier. Sure, I moonlighted as a Brute (often) and as a Controller or Mastermind (occasionally), but most of the time, either I was viciously beating fools over the head with a club that doubled as an energy cannon, or I was unleashing four-legged hell upon heroes with my Crab Spider pack. That, plus being able to call down a gaggle of arachnobots whenever the situation called for it, made for lots of fun times on the Rogue Isles.
I honestly had a lot more fun on the Epic Archetypes than on standard ones. Sure, they're generalists with kooky mechanics and are a bit harder to build because of it, but they're so satisfying once you've got a good set of enhancements on them. Especially Arachnos Soldier - an average, ordinary, everyday Arachnos grunt who's just so well-armed and gotten so damn good at his job that even superheroes are terrified of him. It just really felt great to beat the tar out of the likes of Positron or Miss Liberty, Back Alley Brawler or Synapse with an ordinary Arachnos chump with some distinctly extra-ordinary ambitions.
Also, running Army of Me with x8 the clones was great, and the badge was worth it. "You're not sure how, but you're equal to or greater than eight of yourself."