This a very conceited thing to say. You have no idea what kind of games I either play in or run. I'd suggest the opposite, that your overrating of damage immunity shows a lack of understanding of how many defensive options a lvl 17 mage has that make a 10min damage immunity less attractive.
Your comments on the storm herald barbarian are more legitimate though. I've had some negative feedback on that so I may go back and rewrite/re-clarify that section.