If you treat “powerful” or “OP” as fun, then that’s fine. Oh, for everyone, it’d be nice if you can comment briefly on what’s fun to you, along with for each CO
For me, my mains are my most fun:
======= Swann
I’ve really enjoyed Factory units. Swann specializing in those is a plus. Ditto with having the Goliath. He still has a nice array of towers. Last but not least, I really enjoyed the WoL mission where you got to use the DLD (Drakken Laser Drill), so great to see Swann use this as part of his main thing
======= Stukov
He’s the only Zerg that uses infested terran, which is something that fascinated me since the 1st Sc! His style of free units that keep on coming. Infested Marines cost mins, but they’re discounted, and can help you get out of tough spots in a pinch. His Bunkerlisks are costly, but rather unique. Diamondbacks are such a joy to use!
======= Karax
He’s the only CO who doesn’t have a Goon equivalent that he can mass and A-move (which I find annoying), but then, I do rather enjoy using his SoA lasers (not something any other CO really has, let alone Protoss). He can also do offensive towers (of which I’m a “tower person”)