You ever consider it's because their abilities arn't geared towards killing?
All of the defenders abilities are great, but they don't do a lot of damage. 1 Bubble will rarely ever net you as many kills as 1 GG or 1 Blade dance.
That graph you keep obnoxiously spamming all over the forums is more indicative of the killing power of a subclasses abilities than anything else.
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If killing power is the problem, then there is a simple fix. Allow the bubble to deal damage when activated. Maybe a small shockwave similar to FoH?
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Lack of killing power isn't a problem, they make up for it with utility. Bungie has said that teams with a defender titan on them are far more likely to succeed. Especially in objective based games where using the bubble to hold down an area can really shine. Defenders are a strong class, you just can't always expect them to boast the same kds as the classes with roaming supers.
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So a defender is only good when with a team? Does that not sound like a problem? The fact that a class is only good under a set of circumstances not common in crucible shows that there is an imbalance in the way of how defender works.