Just tried Eureka for first time...

[Vahlnir]

Eureka was quite popular in its day, though there are many on the forums who would attempt to convince people otherwise. It's a pity they opted for quests alone for the EW relic instead of another zone like it.

I mean, it was and still is the only way to get Stormblood's relics. Of course it was popular back in its day. Whether it was actually any fun or not will largely depend on who you ask. Personally, I hated it from start to finish both my first and second time through, but I loved Bozja due to being able to hop in and out of those areas on a whim and still being able to make meaningful progress.