Xur. Amazing Xur, sometimes brings awesome stuff. Most of the time crap. The only thing useful for most of the guardians is "Three of Coins". I think that Xur has to play far more important role that just being a Friday special seller of exotics. Like, if any guardians get an exotic weapon or a piece of armor, give them an additional quest or a timed step questline in relation with that item, which on fulfillment until next friday, the guardian will get special perk like extra three of coins or discounted price on next purchase...etc etc. I am pretty sure, team at Bungie must be thinking about Xur and his role in Destiny universe, but the time is now...so as that Xur doesn't get "OutGunned" :P