I dont understand. How does one figure out the drop rate is bugged?

By killing and comparing to duriel / andy drops

So there is more chance to drop uber uniq from ZIR then Duriel/Andariel?

So its based on anecdotal user experience? Thats all well and good, Im genuinely just curious how this mad Uber Zir rush came about.

when you do duri or andy you usually get a full bag every other run... with zir you get full bag and still stuff left over on the ground... so instead of 33 every 2 runs in duri, you get about 44-50 every 2 runs doing zir

Right, and this is pertaining to the Legendaries that are dropping in addition to the 5x uniques. But the uniques still remain at 5?

uber unique is about the same if not a little less... just better farming for ga items and right now its the thing to do lol

yep roger that, slightly better odds at some nice 2x or 3x GA items.

Thanks for clarify!

I have been farming Zir from the beginning of the season, the reason Zir is "bugged" is because he drops 35% more than other Uber bosses. Every single item on Zir's drop table is a money maker on Barbarian, and I have gotten many Uber rares from Zir running.

4 Greater Affix Razorplate is 30-40 Billion, 1-2GA Rage of Harrogath is around 600m-1b, 2GA Ramadlani's with .4 affix is around 600m, while 4GA can net you up to 8-10 billion

In my opinion no Uber boss is worth doing but Lord Zir atm, until they nerf his droprate. Even then due to his drop table I would keep farming Zir.