I play defender all the time and I go above 2.0 most matches. Just play with defender and get a better feel for what they do. Make their supporting attributes work for you as well. I always switch my defender shield depending on certain situations for example. Need to CAP A then use AOL. Need to provide some cover fire for your team? Then use blessing of light but make sure the bubble is not right in the open, but you can still go back to it when you run out and reuse. Then we have my favorite Weapons of light. Do you need to kill much, much faster? Then weapons of light is for us. I think it gives a 33% bonus or something crazy which make you kill people insanly quick. But make sure you keep the bubble away from the open and come back to it to refill.