I would prefer a chain of quests with story line that culminates in a challenge that results in obtaining a piece of equipment at 100% drop rate (for this, other stuff can be farmed). Parts of this chain can be soloed, others require a reasonably skilled party to obtain.

Actually, this equipment is more than 1 piece, might be nice if I can farm my pants solo, need a team of 8 for body piece, coffer hunt my gloves, get a rare drop to have the weapon crafted...

However they do it, I hope for no cakewalks please but also no 1% drop-rate on hard 8-man boss kill crap. There MUST be a feeling of achievement. I should walk up to Thanos and notice he got his hat and be all "Oh sweet!".

One final thing, don't force me to solo it, if I want to duo with my sister I shouldn't have to kick her from the party to watch a CS and fight a easy mob... That makes me crazy ><