I've found it decent. Fun fights that take time to learn and improve at, doing the content with lots of other players, things to grind out and work towards over time. Pretty much what people had been asking for, for ages. Things to work towards: notes, gear, Phantom Job levels, mounts, the raid, atma, relics, etc.
Yes, most of it doesn't continue out of it but rewards such as mounts and gear do. If you get nothing for 12 hours, there's lots of other things you're getting anyway.
