This is such a stupid argument because the same can be said about any subclass. Just because you think that people don't know how to use it, that doesn't mean that it's true. Any person that is competent enough can use Defender effectively. That being said, the super still needs a buff because it is easily counterable compared to other supers and it has very little defenses despite its description.
And please don't use the argument that I stated above. It is really getting old and just has so many flaws to it.
Edit: Also don't give me any tips for "how to use" Defender because I didn't ask for any. I want real arguments and a real discussion. If I wanted your tips I would ask for them.
Edit: Simple buffs to incorporate would be to make the bubble indestructible or give it additional health and/or make it so that enemies get suppressed when they enter the bubble. I would also be fine if one or both of these were a perk in the skill tree to replace maybe Iron Harvest.
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Just use a shotgun with AoL. No backup plans helps too. Force barrier is pretty good if you actually know how to use it. Always use suppressor grenades to keep those pesky arc blades and stormcallers away. Just a few tips for ya ;)