Yea, I remember tanks being a bit longer to beat down stuff, but 20 levels diff, no.  Even if you hadn't slotted any enhancements.  Your memories are off in both directions.
 
	 
 
	My current Ice/Ice tank can sit in the middle of +4/x8 of some groups (especially council) and everything will die of frostibite if I just walk away for a bit.  Don't have a fire/* tank, but they'd be fine.     Tanks got over tuned actually for offense, but against most stuff, they're almost impossible to get killed.