With the exception of the Thunderlord and the Crux of Crota, I've been rewarded at least 3 of each exotic weapon (only 2 Dragons Breath.) I have not received a Thunderlord at all. I've received the Crux the first week it started dropping and upgraded my Eidolon Ally to a Necrochasm. I've played over 1300 hours and I have still not received a Thunderlord which is the ONLY exotic I'm missing at the moment. I've received 4 Gjallys, 3/5 IBs (after about 1000 hours), 4/5 No Land Beyonds (Crota... Smh), 3 Red Death, 2/3 SUROS Regime, 3/4 Last Words (in 72 hours O.o), 3 Universal Remote, 1/2 Dragons Breath (received one like 2 hours after purchasing from Xur), 3 MIDA Multi-tool, 3/4 Patience and Time, 4/5 Plan C. A lot of exotics I noticed I received as a reward after I purchased from Xur. Similar to how I didn't start seeing Light armor and Lengendary armor for my warlock (my first character) until purchased some from a vendor. I don't think I'll start getting Thunderlords until I purchase one from Xur...