Just wondering Bungie why the scholars who wear cloth robes are now tougher than plate-clad titans if they put a hollowed out sheep skull on their head. Seeing as you seem to like tradeoffs my suggestion would be
Warlock - an exotic which heavily decreases super charge time but makes the player really weak.
Titan - an exotic which acts like the ram but stronger, and disables/slows Sprint
Hunter - an exotic which doubles agility, but nerfs super energy (less hits with arc blade/shots with goldengun)
Just my two cents
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Warlocks turned out to be the real tank class, if you use radiance with the increased damage resistance and your melee shield you can eat rockets and golden gun shots for dinner