Players for the most part know exactly what they want, and what they enjoy.. a big factor in a lot of the unhappiness after they get a feature they asked for is that they never asked for watered down features that was based on a feature they did like.
Case in point.. FATEs; The feature was in GW2 , and people liked that and they wanted SQE to make a better version of it for their game, but they did not improve it at all. What they gave us was a bland event system that reeks of being pushed out the door.
*No worthwhile scaling feature (Basing the difficulty of the next fate on how many people beat it the last time instead of how many are actively participating is bad design)
*Most fates are -very- unfriendly to groups less than eight. (This comes back to poor scaling)
*Very bland FATE objectives (You've all done the FATEs, you know what i'm talking about)
*The fact that they plastered FATEs everywhere (They're just scenery now, instead of something interesting that you want to take part in)