Also keep in mind that as a Defender, you cannot hang out in melee range of the endgame AV's, they have a lot of cones and aoes that will one shot you.
If you need to be in AOE range, you need to time it, and then get in and get out quick.
Oh man, that's funny, that WOULD be true if people tried to avoid fight mechanics, but sadly, they just tunnel and pew pew pew no matter how much damage they are taking, so you will always be healing and rezzing in an iTrial. Unless of course, you get lucky and don't end up with a bunch of scrubs on your team. But that doesn't seem to happen very often.