Firstly this is not a Gree bashing thread, I know they have not done great in a lot of things but they have introduced a lot of events which for one I am thankful for, however, the Raid Boss events, although they are a lot of peoples favourite, is an issue. The event itself is great, the whole syndicate can participate and get rewarded for their participation. All is good in that respect.
The problem lies within the mechanics of the event however, the majority of syndicates cannot get anywhere near to completing due to the insane drop (or lack of drop) rates of the Uzis from other events (please see the numerous threads online with regards to buying Uzi's for money and gold), this is something which I have seen from the beta version way back, it had errors in it then and still has.
Please Gree, get your tech people to sort this out as it is not good enough as it is.