Tanking felt bit squish but I think Tower of Zot trash mobs just have more cleaves among them on top of the fact that given your level your tanks aren't gonna have their OP EW CD augments until 82 (sorry DRK). Thats with my limited tanking in EW. Healing feels the same for me thus far though. Havent leveled Sage yet so idk how that pans out and I'm not gonna begin to judge it till its at least 80.