big thing that makes regen not *as* clutch is Torpor at 60.  Its very efficient and if you're trying to solo a big-baddy (like a dragon) then your innate regen isn't going to matter as much since you'll likely be having Torpor ticking a lot of the time.  Iksars don't really get any benefits that a Troll doesn't have (innate AC, but it isn't likely to matter much) while not being able to use the JBB.  In a war of attrition (slow the mob and tank with torpor) then your mana is precious and time is against you, the JBB allows you to increase your DPS without having to expend mana. 
 
Edit: Keep in mind, in a group you're not going to notice a difference.  Where the subtle differences come into play is when going after Big Game (like solo'ing lodi). 
		
		
		
		
		
			
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Baalzy - 57 Gnocro, Baalz - 36 Ikscro, Adra - 51 Hileric, Fatbag Ofcrap - 25 halfuid 
 
Red99 
Baalz Less - Humger, Baalzy - Ikscro 
If MMORPG players were around when God said, "Let there be light" they'd have called the light gay, and plunged the universe back into darkness by squatting their nutsacks over it.
Picture courtesy of azeth  
			 
		
		
		
		
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