Unsure if this is the desynch people are talking about, but when I'm surrounded by 3+ mobs, the attack animations either don't show up at all, or only show up sometimes. This isn't a typical lag, because its still responsive. Its just that the damage numbers I see on the screen and the attack animations aren't synched properly. This rarely happens when fighting less than 3 mobs. Although this could be more than just desynch, because that wouldn't explain attack animations not occurring over a longer period (several minutes) when the other functions of the game, and combat are responsive.
Overall, the netcode seems to work fine for me. I've only been disconnected once, and rarely get any rubberbanding. I'm unsure what my ping to the server is, but its playable nonetheless.