Please leave Defender alone.
It is not underpowered and does not need a buff of any kind. It is perfect as it is in its current state.
I love Defender and if it was buffed it would become too powerful and overused, causing the cry-babies to rush here and to Reddit to request the nerf the majestic beauty of this amazing subclass. It would be nerfed into the ground. I don't want this to happen.
K/D does not make or break a subclass. Defender's Ward of Dawn is the only non-offensive super, because it's defensive. Because of this it's going to have a lower K/D than the other subclasses since it doesn't basically guarantee free kills (*cough*Fist of Havoc*cough*). It rewards gun skill and good timing/placement.
Force Barrier is amazing. A 40-55% boost to health on a melee kill is great and is in no need of a buff. It's not like Flame Shield since it requires a kill to activate it, rather than just a hit. The perks for Disintegrate are also perfectly balanced and deserve no buff or alteration.
The grenades are also great. Suppression grenades are awesome and are very useful for shutting down those pesky supers that seek to end your valorous killstreak. Spike grenades are very rewarding when placed correctly. Magnetic grenade is also great, and yes I will stick you if you start dancing outside my bubble. It's my time to shine, not yours.
None of the perks in the skill tree are underpowered in the slightest and can be useful in many areas. Some may only really be useful for PvE engagements, but that's what they're intended for.
Defender shines most in PvE, but it can be just as good in PvP with the right set up and skill level. Do not buff Defenders. We are perfectly capable of fighting our own battles with what we've got and don't need a leg up from a buff.
Leave Defender alone. Thanks
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You'll either use magnetic or suppression grenades. Something needs done about Spike grenades again Also, would be nice if the shatter nova bomb didn't destroy the bubble and you when inside. They did fix Razors Edge getting through Also, would like it if No Back Up Plans had sidearms and fusion rifles also proc Force Barrier as they are close quarters weapons too. Would be nice to have a "timer" on how long Ward of Dawn lasts. Illuminated needs a tweak for Armor of light some how, like suppression when someone enters or increase in armor rating when leaving it.