You arealways connected, so I don't think it matters that much if you're solo or in a dungeon. It does suck, though

Yes, I still experience lots of rubberbanding, latency spiking up and other such issues, even on a good Ethernet connection. I really hope they’ll eventually get this right and latency will be able to sit stale around 50 ms, or something.

Also, after summoning the mount, it’ll sometimes take seconds before it’ll actually move normally, very frustrating. But I’m not sure if that’s network-related or a bug. Many people report this issue.