Nah, I find our defenses to be balanced within the context of our overall package. 50% heal every 2 minutes, stun break on a (glyphed) 1.5 minute cooldown, and fear break/self-heal on a 2 minute cooldown, and AMS on a 45 second cooldown that absorbs 75% of spell damage (100% if glyphed). I don't feel like we are really lacking in the defensive department, although we are brittle by design when those cooldowns aren't available. It's a necessary weakness for sure, but I don't consider it too terrible a hindrance.