Ogre stun immunity isn't really that game breaking or super overpowered. I'd say it's the best shaman race ability but it's rarely going to be the deciding factor in being able to solo something and in the cases that it is, the issue can just as easily be fixed by playing smarter/better.
All that said, Troll regen is nice but it's probably the single most overrated bonus in the game. It's like 1hp/tick, right? Wow, 10 whole HP every minute... AWESOME.
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