You can please all of the people some of the time, some of the people all of the time, but you can't please all of the people all of the time.
I have not been in game a long time... less than a year, in fact. During that time, I have seen some so-called events handled rather poorly... but I think that Marco, his staff, and MA are learning from experience. Honestly, they asked for our opinion about Merry Mayhem, and we gave it! Are you so surprised that they made changes to the event based on those opinions?
Yes, some were disappointed (very vocally, I might add) about the changes in category split. But, isn't that what we asked for? We cannot, as a large majority, say to MA... hey, the mid lvl category is too widespread, split it up!... and then be furious that they did. And if you read the original Merry Mayhem thread, yes, the majority of the posts stated that we wanted that split to happen.
As someone already stated, you have a choice to participate or not. In no instance did MA state that if you do not participate in this event, then you cannot log in and play the game until the event is over.
As far as the contraction unit goes... yes, I am quite certain a lot of ubers got those from shooting a lot of uber bots. However, I also know from in-game as well as here on EF, that at least 4 or 5 of those contraction units were looted from low lvl bots, not to mention the few BPs that were also discovered. So, that means at least 1/3 of the POE goes to non-uber players. Now, not so sure about some of those players, but I am pretty certain the person I know in game who looted one is not a huge depositor. And I also know he is not considered to be "uber" nor does he use uber equipment.
5 out of 15... that is really NOT a hard pill to swallow when you think about it.
Sorry if you felt that MA gave YOU the shaft during this past event... but, if you entered the event fighting bots with the expectation that you would absolutely loot an exceptional contraction unit, you were doomed to disappointment from the start.