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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More tradeoffs. Titan strong.