I'll need some help doing this but just want to do some percentage and rarity values for exotic weapons available in game.
You can copy and paste what I have written here and place an O next to ones you own and an X next to unowned, than you can continue with which ones you can't wait to get and have some conversations about them.
I will update the list with percentages once there's enough data.
Bad juju-80%
Dragon's Breath-72%
Gjallarhorn-49%
Hardlight-49%
Hawkmoon-32%
Ice Breaker-96%
Invective-81%
MIDA Multitool-70%
Monte Carlo-34%
No Land Boyond-77%
Patience and Time-80%
Plan C-82%
Pocket Infinity-72%
Red Death-42%
Super Good Advice-76%
Suros Regime-70%
The Fourth Horseman-29%
The Last Word-93%
Thunderlord-44%
Thorn-77%
Truth-76%
Universal Remote-54%
Vex Mythoclast-65%
Update: initial percentages, still have quite a bit to go yet, check back for regular updates.
Rarest gun so far: The Fourth Horseman (PS exclusive)
Rarest non exclusive gun: Red Death
Most common gun: Ice Breaker
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Excluding PS exclusives I have the 2 rarest exotics on the Xbox, Thunderlord and Red Death. It's funny how they are both my favorite weapons in the game.