People asked -
"Can we please have big open world bosses so we can team up and take them down together?"
Odin and Behemoth fates were born.

People now ask -
"Odin and Behemoth fates are a waste of time and pointless. Make them instanced!"

Not that I disagree at all, they definitely should be instanced.
However it is rather amusing that people asked, they got, then they hated.

I can understand what SE was trying to do with them, but to be honest the execution didn't really work out. Something more like the Guild Wars 2 world bosses would be ideal (such as Jormag, The Shatterer etc.. If you don't know them, YouTube them), and Behemoth increasing in size by about 10. Odin however should definitely be instanced.

If you did play GW2, you would agree with me when I say that the FATE or "events" were much better designed. The mechanics were better, the functionality was miles and miles ahead, and quite simply the ability to actually see the mob from a very large distance was another thing.