Anemos I didn't mind too much, but Pagos I have several issues with.
1. Map design. That canyon in the center is a pain in the butt having to slow walk past dragons and other creatures while trying to get to the NW section. The NW aetheryte should really have been level 25 or 27 or so considering the level range of NMs in that section. The cliffs are annoying, and while walking past sleeping dragons was cute at first it's just annoying and tedius by the end.
2. All this for relics? Anemos at least had upgraded and dyable artifact armor. Pagos exists only for weapons and it feels like a bit...much? When the development time put into Eureka could have been spent on something more than just relics. Just feels like more resources are being put into it than necisary. Or they could have added a new fleshed out main story zone in a patch instead of this.
3. Light grinding. Okay maybe having us hit 20 and killing Pazuzu once or twice was a bit too easy. But filling this light kettle 31 times just feels like overkill to me. The whole reason I liked Anemos in the end was that the grind was front loaded, once you hit level 20 it became much easier to get the upgraded gear for multiple jobs if you wanted to. Now in Pagos, it feels like getting to 35 is just the start and now you have to mindlessly grind dragons to fill your kettle at a decent pace.
I've heard that Pyros might have more armor so that's good. If they address these three points then maybe Pyros will feel more like Anemos and less like Pagos for me which will be good. However, there are a couple issues I have with Eureka in general and not just Pagos. Though these are generally lesser.
1. The story is being stretched thin. There really isn't much story for Eureka. It's being split across three or four zones so that it lasts longer, but the story really doesn't feel deep or complex enough to warrant it. It's just 'go gather magecite, oh and once a zone we'll give you a story cutscene that actually matters.'
2. The magia board thing. It seemed cool at first but it's actually pretty shallow. Rarely is there a reason to not just stack all five of your magecite on one element and spin it to attack, or here and there maybe to defense if you're a healer or tank. It never really affects gameplay, just the damage numbers coming and going. There's rarely any thought put into it.
3. If they're going to have this elemental leveling system independant of normal levels, why not just sync us up to 70 inside and let people get exp for alternate jobs while in there similar to deep dungeons? The ilvl sync is so low that gear is pretty much irrelevant anyway. They could just make it 100% irrelevant and just have elemental level and magia board matter.