1 more to the "thanks for talking to us but it's not good" crew.
I cannot fathom how this challenge was rolled out. The boards have been full of requests to deviate from challenges that promote soloing routine. You had every single weapon in the game to see that, what, four weeks? And yet, after one team-based challenge, back we are again.
The awful balance on items dropped has been discussed ad infinitum, even after the chests were "updated." And you roll out a challenge that actually slows down the progression towards chests if you want to contribute to the community goal. W. t. F?
The declining player base--most poignantly illustrated by the "h-to-v" turn of the most active poster here--has been discussed. Heck, even then, the player base is fragmented into those who have the DLC and those that wisely turned it off. With all of that information available, how the heck were your telemetry numbers that staggeringly off? (What are the animals supposed to add anyways? Further loss of immersion? Certainly not a greater reward for greater challenge.)
Saying that you are reading the boards is undone if you don't actually do anything about the situation. There was hope that the situation was righting itself with the participation of developers in conversations, and then you just went right back to the same old problem. Saying that you are listening is not listening.
How about throwing a poll up about possible changes. A timetable for crafting? A fix for the widely-useless items in the multiplayer? A map variety that added, say, tactical positions besides LoS and pretty fire? (Seriously, the first update rivals Defiance's for sheer "we don't get our players' needs" value.) A point to the stupid rhino in the middle of a chateau?
Clean up the animals. Implement a real crafting system. Fix the plethora of useless items.
If you cannot come up with 8-10 weekend challenges that actually promote cooperative play, shelve that until you can. HINT: Actually having a guaranteed way to improve an aspect of your play via the leveling, ultra-rare drop in the weekly commendation chest is a lot of what spurred (for me, at least) interest in ME3's weekend challenge.
["Warning points"? Wow. Time well spent, there.]