I think the supers were very unique in D1.
-A powerful smash
-A defensive Bubble
-A powerful throwing super
-A powerful gun
-A melee only super
-A suppressing, slowing, damage boosting field
-A massive explosion
-A buff to abilities
-A hitscan AOE damage
The only similar ones were bomb and smash, which weren't even that much the same due to the ranged aspect of bomb.
Now in D2:
-A roaming charging super
-A roaming charging throwing super
-A Gun super
-A melee super
-A single use super
-A roaming throwing super
Sentinel and poledancer are very similar, striker is only a little different, and dawnblade is just another roaming throwing. Not saying I don't like them, but the uniqueness is gone.
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That's a consequence of Bungie's change in philosophy. Bungie has said they want all Supers to be offensive in nature. With every super trying to do the same job there obviously becomes an issue with diversity.