You can outrange the fear but it is tight and different dragons have different abilities. I can almost 2-man those dragons with the pally tank and the priest as long as I can avoid adds. My priest regens mana quicker than used for heals. It will just take a long long time.

You need to prepare yourself beforehand for a very long fight though. The biggest problem I had was getting feared into adds. If one of my crew got feared close to the edge I would reposition them manually far far away. The last one I did on Bashirs Landing did a knockback that was really annoying and even if you clear the area you get respawns before the dragon is dead and with the knockback you can get a few.