I wish Eureka could be like WoW's Timeless Isle
For those who don't know what the Timeless Isle was, it was an open world area released in Mists of Pandaria's last patch, where there were many elite monsters of various strenghts, mechanics and attributes, some rare elite monsters, timed free-for-all bosses, daily quests and chests. You could trade timeless tokens for mounts, gear, minions and glamour items.
Monsters could drop gear tokens and timeless tokens with rates that depended on their strength, quests and chests rewarded timeless tokens and gear tokens. Gear tokens were generic items that when used, generated a piee of gear with random stats (for example, using a leg token as a tank would give you a leg tank gear).
Because you couldn't fly in that area, you had to actually fight your way towards the further areas (such as crossing an infamous bridge).
So the Timeless Isle was a place where you could chill solo or with some people. If solo you would farm the weaker monsters, if in group you'd go for the stronger ones for better rewards. There was a super boss, Ordos, the god of fire, that spawned on the furthest, strongest area of the isle, that area was only accessible for people who had the legendary item so he had that "exclusive" feel that so many crave in MMORPGs.
It was basically Diadem done right.
I think it would serve this game well as "something to do" in endgame besides dungeons and raids. It had a nice old school MMORPG feeling where you didn't have a set objective, there was no set group size, you could get surprised by finding rare monsters and items, hell, you could simply get killed because you aggroed more than you could chew.
Just leaving the idea here... it didn't please everybody but personally I really liked that content.
http://i.imgur.com/96dOmlT.jpg