I enjoyed Eureka for the most part. The only parts I didn't care for were fairly minor.

1. Map design for Pagos and Pyros. Pagos my issue was that narrow canyon that served as the only way to get to any of the upper areas by foot. Pyros was just the way the map was mostly narrow pathways.
2. The planning for turn ins on the Pagos step of weapons. The way they'd inserted the light grind felt like it was tacked on after someone had planned out the other resources resulting in the light grind being the stalling point for everyone building the weapons. It wasn't as bad in Pyros.
3. Drop rates for the items that upgraded the boards and rare item drops from specific fate enemies felt excessively low.

I'm actually hoping for new content similar to Eureka in the future. My issues with Baldeson's Arsenal weren't about the content itself but more with the player community in regards to their approach on it as tended towards them saying "all of this stuff must be present or we aren't going to try" rather than "ok we have all of this so lets see how we can make it work"